Sinn U50-T Hydro S Black Fully Tegimented on Silicone Strap

SKU: SI-161

Watch Brand: Sinn

Sinn North America

New Release

Fully Tegimented midsize diver's watch with quartz movement and oil filled case
• Watch diameter (mm): 41.0
• Watch height (mm): 11.8
• Lug width (mm): 20
• Lug to lug (mm): 47
• Weight - head only (grams): 72
• Water resistance: 5,000 meters
• Case back: Solid
• Case finish: Black DLC steel
• Case metal: Tegimented hardened DLC steel
• Dial color: Black
• Front crystal: Sapphire
• Tegimented: Fully
• Calibre: Ronda 715 Li
• Movement: Quartz oil filled
• Strap or bracelet: Strap
• Manufacturer's limited warranty: 3 years
• Warranty service: Sinn Germany

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WatchBuys Direct Price: $3,250.00
Availability:  In Stock - Ships Immediately

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Condition:  This Sinn watch is brand new and unworn

Authorized:  WatchBuys is Sinn's official importer and distributor
This watch ships free to US, Canada, Puerto Rico, Guam and APO/FPO/DPO locations from NC with select shipping methods

Sinn U50-T Hydro S Black Fully Tegimented on Rubber Strap
Sinn U50-T Hydro S Black Fully Tegimented on Silicone Strap

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Sinn U50-T Hydro S Black Fully Tegimented on Rubber Strap
Sinn U50-T Hydro S Black Fully Tegimented on Silicone Strap
Sinn U50-T Hydro S Black Fully Tegimented on Rubber Strap
Sinn U50-T Hydro S Black Fully Tegimented on Silicone Strap
Product Details
Oil Filled Diver's Watch for All Wrist Sizes

After seeing the immense success of Sinn's midsize (41 mm) U50 Collection over the past few years, Sinn fans probably could have guessed that this new watch would someday join the expanding U50 lineup. 

Sinn developed their first watch to feature an oil filled case in 1996, and that watch was named the Sinn 403 Hydro.  Now, 28 years later, the new Sinn U50 Hydro once again packages this technology in a 41 mm case size.  This version features a black, fully Tegimented (hardened) case and bracelet and is named the Sinn U50-T Hydro S Black.

Sinn 403 Hydro

Original Sinn 403 Hydro From 1996

The new Sinn U50-T Hydro S Black checks in at 41 mm, 3 mm less than the Sinn UX (its older brother) while maintaining a remarkable 5,000 meters of water resistance. 

This case design also provides a 32% reduction in total weight compared to the Sinn UX, and at just 11.8 mm tall, Sinn has managed to reduce the height by more than 11% compared to the Sinn UX.

While the Sinn U50-T Hydro S Black is closely related to the Sinn UX with its oil filled case technology, the watch actually shares much of its design DNA with the Sinn T50 series.  The hour markers, indices, and hands closely match those of the Sinn T50, but with red accents to capture the overall color scheme of the Sinn U Series.

In line with the other black Sinn U Series watches, the Sinn U50-T Hydro S Black case is made from Tegimented (hardened) German submarine steel by SUG in Glashutte, Germany.  Both the case and Tegimented bezel feature a DLC finish as well.

The oil filled Sinn U50-T Hydro S Black represents a unique and innovative approach to diving watches, offering exceptional legibility at any viewing angle, extreme water resistance, and durability for divers.

Built for Extremes

Unlike other Sinn dive watches, the Sinn U50-T Hydro S Black utilizes a temperature-compensated quartz movement instead of a mechanical one.  The oil filling creates resistance and friction that a mechanical movement would struggle to overcome.

Filling the watch with a clear oil greatly enhances the readability of the dial from any angle (including under water) and increases the water resistance of the watch.

The oil filling acts as a barrier against water intrusion despite immense pressure, making the watch incredibly water-resistant to depths of 5,000 meters. It is more than suitable for both professional and technical diving.

Reduced Internal Reflections

When it comes to reading the time on the Sinn U50-T Hydro S Black, you'll quickly notice that light behaves differently with this watch compared to standard watches.

With standard watches, as light enters a watch crystal, part of it passes through directly while some gets reflected at the interface between the crystal and the air inside the case. This reflection creates the dreaded "mirror" effect and reduces the clarity of the dial, especially underwater where light levels quickly diminish.

The Sinn U50-T Hydro S Black is filled with a clear oil with a refractive index very close to that of the sapphire crystal. This oil creates a more uniform medium for light to travel through. As a result, light entering the crystal experiences minimal refraction where the crystal meets the oil and travels almost directly to the dial, significantly reducing internal reflections and glare.

With less glare and distortion, the dial becomes much clearer and easier to read, even in low-light conditions like deep underwater environments. This is crucial for divers who need to make quick and accurate readings of their time and other critical information.

A Durable 41 mm Case

The watch case of the Sinn U50-T Hydro S Black is made from the same steel used in the construction of the outer hull of submarines.  The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germany's North Sea shipbuilding yards who construct submarines using the material.  

Another important and practical feature of the submarine steel case is corrosion resistance.  The case of the Sinn U50-T Hydro S Black resists the effects of exposure to salt water and salt water environments.

The black uni-directional rotating bezel is milled from the same submarine steel as the case and is Tegimented. The indices are machined directly into the bezel without the use of bezel inserts, which can corrode or come loose at deep depths. 

Important features of this watch include:

  • Oil filled case
  • Temperature compensated quartz movement
  • Black Fully Tegimented case made of German submarine steel
  • Black uni-directional Tegimented submarine steel bezel 
  • Water resistant to 5,000 meters
  • Screw down crown
  • Date display at 3
  • Functional reliability from -20°C to +60°C
  • Sapphire crystal with double AR coating
  • SuperLuminova on the hands and hours (glows green)

This watch is fitted with a Sinn silicone strap with a DLC fully Tegimented diver's clasp.

Frequently purchased with this watch:

Watch specifications are provided by the respective watch manufacturer and/or other sources. Although we use best efforts to provide accurate information, we reserve the right to make corrections when advised of specification changes and/or content errors.

WatchBuys is the official and authorized North American distributor and importer for Sinn watches.

When you purchase your new Sinn watch from WatchBuys, you'll not only get a finely engineered timepiece with excellent value for money, you'll also benefit from the WatchBuys Sinn Advantage.

WatchBuys Advantage #1

Because we are the official and authorized North American Sinn distributor and importer, your name and watch serial number will be automatically registered in our database for a Sinn manufacturer's limited warranty which we pass through.

This means that should your watch require service during the Sinn manufacturer's limited warranty period, service will be provided by Sinn in Germany when you return your watch to them. This Sinn manufacturer's limited warranty is transferable to subsequent owners as allowed by Sinn.

You are responsible for paying the shipping charges to Sinn, and all repairs that Sinn approves under its warranty are at no charge. Sinn will also pay the return shipping charges to the address you specify.

The Sinn manufacturer's limited warranty period is as follows:
  • Watches in the EZM Series: 3 years
  • Watches marked AR containing inert gas: 3 years
  • Watches in the DIAPAL Series: 5 years
  • All other Sinn models: 2 years

WatchBuys Advantage #2

As an added benefit to those who purchase Sinn watches from WatchBuys, you may choose to have your warranty repairs serviced through our US Sinn Authorized Service Center, RGM Watch Service located in Mount Joy, Pennsylvania. This added benefit saves our clients the time and effort of returning their watches to Germany for repair. This service is transferable to subsequent owners who purchase directly from the original registered owner.

Please note that you are responsible for paying shipping and insurance charges for sending your watch to RGM. Once they reach your watch in the service queue they will determine which repairs are covered under Sinn's warranty.

It is important to note that oil-filled quartz Sinn watches must be repaired in Germany (EZM 2, Hydro and UX series). If your watch meets one of these conditions and requires service under warranty, please click here for instructions on returning your watch to Sinn in Germany.

WatchBuys Advantage #3

Your watch will be repaired at no cost to you other than shipping charges to either Sinn or RGM during the warranty period. Sinn watches purchased through the "grey market" (non-authorized sources) may carry no warranty from Sinn. Sinn watches purchased through authorized overseas retailers are governed by the warranty policies of those dealers and/or Sinn, and typically must be sent to either the overseas dealer or Germany for repair.

WatchBuys Advantage #4

You'll be wearing your new Sinn watch soon after your order is placed since we stock Sinn watches and ship free using UPS Air. Plus, since we are located in the United States, there are no "hidden charges" for shipments to US residents as is the case with most overseas dealers. Such charges can add up to 15% to the cost of your new watch, and include credit card surcharges, foreign exchange credit card bank fees, import duties and taxes, and custom's broker charges.

WatchBuys Advantage #5

WatchBuys offers a comprehensive return policy with no restocking fees to US residents. Overseas dealers, including those involved in the grey market, typically don't offer a return policy, and if they do, returning a watch under the policy is both complicated and expensive due to import/export and custom's requirements. Restocking fees are also common and may range up to 15%.

Learn more about our return policies.

WatchBuys Advantage #6

WatchBuys is pleased to accept payments through PayPal, debit and credit cards. We charge no surcharges to use credit or debit cards, and because we are based in the United States your US card is charged in US dollars with no conversion or exchange rate fees.

We also accept payments from PayPal and charge no surcharges.

Please note that to pay by credit card, debit card or PayPal your account and/or card must be issued by US or Canadian financial institution and billed to a confirmed US or Canadian address.

WatchBuys Advantage #7

When you purchase your new Sinn watch from WatchBuys, you'll earn WatchPoint Rewards which accumulate and may be redeemed against future purchases.

Sinn watches feature a number of cutting edge technologies, many of which are unique to Sinn. Please note that not all Sinn watches, including the watch on this page, use all of these Sinn technologies.

Among the more notable Sinn technologies are:

Tegimented Hardened Cases

Many Sinn watches are fitted with Tegimented cases produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

Standard steel used by most watch companies has a hardness of between 200 and 240 HV (Hardness Vickers is a common scale used to measure material hardness). The Tegiment process produces a hardness of at least 1,200 Vickers which is five times harder than standard steel (and on some Sinn models up to nine times harder than standard steel).

The Tegiment process is not a coating consisting of a foreign material; instead the steel itself that has been hardened using a special engineering process that creates a hardened barrier. The base material is a type of stainless steel also used for surgical implants, and the stainless steel resistance to corrosion is further improved by the Tegiment hardening process.

The primary advantages to a Tegimented case are extreme resistance to scratches and other case abrasions, as well as increased resistance to corrosion.

Please note that certain Sinn watches are fully Tegimented (case, bezel) while others are Tegimented only on the bezel. Use the links below to view both categories.

  • View Sinn watches with fully Tegimented cases.

  • View Sinn watches with Tegimented bezels only.

Dehumidification Technology

A number of Sinn models feature cases filled with inert gas. Sinn has found that filling the case with inert gas can help prevent the introduction of moisture and humidity to the case, as well as provide a more stable environment for the oils that lubricate the movement.

The proper care of any mechanical watch movement mandates that these oils maintain both their viscosity and lubrication properties.

  • View Sinn watches with dehumidification technology.

Copper Sulphate Capsules

A number Sinn models use one or more copper sulphate capsules to absorb humidity trapped inside the case. Over time these capsules will gradually turn dark blue indicating that humidity has been absorbed.

The primary benefit to these copper sulphate capsules is a more dry and stable environment for both the movement and the lubricating oils. Together with Sinn's inert gas treatment these capsules form the basis of Sinn's Dry Hold Technology.

This technology not only provides a more stable environment for the movement, but also prevents fogging of the crystal when going from hot to cold environments or from humid to non-humid conditions (such air conditioned buildings).

  • View Sinn watches with copper sulphate capsules.

Extreme Antimagnetic Protection

Magnetism can cause dramatic swings in the timekeeping of a mechanical watch movement. People are often exposed to magnetic fields without even being aware - frequent high altitude flying, metal detectors, audio and video equipment, medical equipment and computer equipment can all cause problems with magnetism.

Many Sinn watches offer extreme protection against magnetism up to 80,000 A/m. Sinn achieves these results using a number of different technologies, including special case and case back construction, soft iron components in the case and protective rings surrounding the movement.

  • View Sinn watches with extreme antimagnetic protection.

DIAPAL Oil Free Escapement

Sinn caused quite a stir when they first released their DIAPAL technology. Beginning in 1995, Sinn began work to create an oil free escapement. With any mechanical watch movement, the aging of oil, especially in the escapement can create long term problems for that movement. Additionally, as movement oil ages, required service intervals become more frequent.

Sinn's early analysis to this problem provided a quick solution (at least in theory) - if you don't use oil, it can't age. The process began by exchanging the ruby escapements for diamonds (the word "DIAPAL" derives from the German name for diamond escapements) in order to achieve the desired effect. The designation stuck, even though today Sinn works with solutions taken from advanced nanotechnology rather than diamonds.

The result is a movement that proves so reliable that Sinn offers an unprecedented five year warranty on their DIAPAL watches.

  • View Sinn watches featuring the DIAPAL oil free escapement.

Hydro Oil Filled Technology

Sinn has developed a technology termed "Hydro" in which the entire watch case is filled with oil. Watches using this technology are based on quartz rather than mechanical movements.

By using this type of movement, Sinn is able to fill the watch with oil, which has the joint affect of greatly enhancing the readability of the dial and time from any angle (including under water), and increasing the water resistance of the watch even at great depths.

  • View Sinn watches with Hydro Oil Filled technology.

Submarine Steel

Sinn has created a line of watches featuring cases made from German submarine steel (the U Series). The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germany's North Sea shipbuilding yards who construct submarines from the very same steel.

Because of the special steel used from the submarine steelmanufacturer, the case resists the effects of exposure to salt waterand salt water environments.

These cases are produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

This special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized. The watch movement itself is protected from magnetic fields up to 4,800 A/m.

  • View Sinn watches built from German submarine steel.

EZM Mission Timers

Sinn is a partner for manufacturing watches for the German Special Forces, including SWAT, Customs, FBI, helicopter police, GSG9 and other units.

Beginning with the now highly collectible (and valuable) Sinn EZM 1, Sinn has grown this collection to some of the most durable and highly functional watches made and they remain among the most popular in the collection.

  • View Sinn watches in the EZM Series.