Sinn Dive Watches

Sinn Dive Watches - the Sinn U1, U2, U50 and more stunning divers watches.

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Sinn’s collection of dive watches is diverse, original and technology lead. Most popular in the Sinn dive watches range are the Sinn U1 (1000m), the Sinn U2 (2000m & dual time) and, our favourite, the Sinn UX range with HYDRO technology. ChronoDivers takes a deep dive into this fine collection of timepieces including a review of their key functions & features. We also consider the best online places to buy a pre-owned genuine Sinn watch.

Founded in 1961 Sinn is a company lead by innovation and design. Sinn produce watches that are instantly recognizable – similar to those of Bell & Ross – they have their own unique styling.

Introducing Sinn Watches

We have to go back to 1961 when Helmut Sinn founds the company “Helmut Sinn Spezialuhren” in Frankfurt. The company’s focus at that time was the manufacture of navigation clocks and pilot chronographs. There are few companies in the horological arena with such an impressive history of innovation, exploration and certification. Lothar Schmidt, an engineer himself, bought Sinn in 1994 bringing with him a burning desire for technological development. Innovative features such as Sinn Hydro – filling the watch dial and hands void with an oil to prevent reflection when under the water …..

German Submariner Steel

One of the standout USP’s of the Sinn range of dive watches is their choice of material for the casing. Sinn use a unique high-strength, seawater-resistant German Submarine Steel for all their cases and crowns. Many models have the optional extra of Sinn TEGIMENT (a patented stainless steel case hardened technology providing extremely effective protection from scratches)

Clearly Visible Time-keeping

One thing that really sets our teeth on edge at ChronoDivers is when an alleged “dive watch” has hands colour coordinated to the watch’s dial. White hands on a white face might look quirky in the office, but try and read them under water! The Sinn range of divers’ watches all have highly contrasting dials and hands. Most models feature a matt black dial and contrasting white hands and indexes – precisely what you need in low visibility – 30 metres under the sea.

Best selleing Sinn U1

With a fusion of engineering prowess and design finesse, this timepiece stands as an embodiment of superior craftsmanship, poised to redefine the standards of rugged elegance and functional excellence.

Design and Construction

The Sinn U1 is a marvel of modern engineering, sculpted from the esteemed German submarine steel that lends it an exceptional level of durability. Standing as a symbol of technical prowess, the U1 encapsulates strength and substance through its pronounced 44mm case, embracing a harmonious blend of brushed and polished surfaces. The iconic crown guards, reminiscent of maritime instruments, add both an aesthetic touch and fortify the watch’s rugged appeal.

Exploration Awaits

Unveiling the U1’s prowess requires a closer examination of its exceptional features. The unidirectional rotating bezel, calibrated with meticulous precision, empowers divers with an accurate tool for measuring immersion times, epitomizing reliability in the most demanding underwater scenarios. The dial, a testament to legibility, employs bold indices and hands infused with Super-LumiNova, ensuring impeccable readability in the darkest abyss or the grandest ballroom.

A combination of images from Sinn’s media library. The final watch here is a FULL SET Sinn U1 discovered on eBay complete with box and papers. Notice the position of the U1’s crown at the 4 o’clock position – this prevents pressure on the back of the hand when bending the wrist. The first two watches are coated in black hard coating PVD – in conjunction with TEGIMENT anti-scratch treatment.

The Pulsating Heart of Precision: Movement Unveiled

At its core lies the esteemed Sellita SW200-1 automatic movement, a testament to horological precision. Its mechanical mastery ensures unwavering accuracy and consistent performance, aligning with the aspirations of professionals and enthusiasts alike. This movement, bearing a power reserve of 38 hours, echoes the steadfast nature of the U1, reassuring its wearer of a reliable companion on every odyssey.

Versatility Redefined: Straps and Beyond

Adapting to diverse lifestyles and tastes, the Sinn U1 offers a spectrum of strap options. From the robust stainless steel bracelet, a harmonious extension of the case, to the sporty rubber strap, embracing aquatic prowess, and the rugged leather alternatives that evoke nostalgia, the U1 seamlessly transitions between various scenarios, a chameleon of style and utility.

Epitome of Refined Excellence: Final Thoughts

In summation, the Sinn U1 Dive Watch is a symphony of form and function, an instrument of precision designed to withstand the rigors of exploration and to grace the wrist of the discerning individual. It harmonizes the realms of maritime heritage, modern technology, and aesthetic elegance, exemplifying the convergence of purpose and design. As time journeys onward, the Sinn U1 stands as a beacon of excellence, inviting wearers to embark on their own ventures, both beneath the waves and within the confines of a stylish metropolitan landscape.

Notable Models

Sinn U2

The Sinn U2 is a sibling to the U1, offering a similar design language with a few distinct differences. It usually incorporates a larger case size and is often made from high-quality German submarine steel, adding to its robustness and corrosion resistance. The U2 also features impressive water resistance and a focus on legibility, making it a dependable choice for diving activities.

Sinn U50

The Sinn U50 is a more compact and versatile option within the collection. It maintains the core attributes of Sinn’s dive watches, such as water resistance and durability, but in a smaller case size that’s suitable for a wider range of wearers. The U50’s design is often appreciated for its balanced proportions and clean aesthetics, making it suitable for both underwater adventures and daily wear.

Sinn U212

The Sinn U212 is another notable model, recognized for its innovative use of materials. It often utilizes a case made from German Submarine Steel, which offers exceptional resistance to saltwater corrosion. This model combines the rugged characteristics of a dive watch with the technological advancements that Sinn is known for, resulting in a timepiece that’s both functional and advanced.

Certified by DNV GL

GNV DL tests and certifies Sinn diving watches – ensuring they are both water resistant and pressure resistant. Their testing criteria is so strict it qualifies for certification in accordance with the European Standards for Diving Equipment. The Sinn U1 is compliant with European diving device standards EN250 and EN14143

Certified Authentic Sinn ✅

Browse all the new and used SINN watches covered by the industry respected eBay Authenticity Guarantee (UK & USA only) ✅ Read our guide – how does the eBay Authenticity Guarantee work. Choose from dozens of stunning Sinn watches all covered by the authenticity guarantee – click the button below

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UX S Combat Swimmer

An accolade that many dive watch manufacturers strive for is the adoption of their timepieces by the National Armed Forces. Germany’s Commando Frogman Force KSM (Kommando Spezialkräfte der Marine) are one such division endorsing Sinn divers watches. The Sinn Mission Timer UX S Combat Swimmer (EZM 2B) is worn by all KSM divers. An  international tender was placed by the Federal Office of Bundeswehr Equipment (BAAINBw) with strict guidelines to how the watch must perform. The Sinn UX was selected over the competitors watches – proof enough that this is a very competetent, professional underwater timepiece.

Development of HYDRO Technology

Visibility of a dive watch at depth is second only to water resistance. Sinn developed their own HYDRO Technology – introduced in the Sinn 403 HYDRO for the first time. This innovative design feature provides freedom from fogging and optimal readability at any angle.

Compliance to European Standards

SINN manufacture diving watches in compliance with European diving equipment standards – they were the first company to do so. They were also the first to put their dive watches through third party testing to certify them for pressure resistance, water resistance and resistance to fogging.

Sinn 140S in Outer Space

We all know that Omega Speedmaster watches have been worn in space, but they’re not the only brand with that claim. In 1985 the German physicist / astronaut Professor Dr. Reinhard Furrer wore a Sinn 140 S during the D-1 spacelab mission. In doing so he proves the watch’s self-winding mechanism works even in the weightless conditions of space.

The Sinn 140 S chronograph as worn by Reinhard Furrer on a Spacelab mission

A to Z of the rest of the Best Dive Watches

We massive fans of the Sinn Divers Watches – but don’t forget to check out some of the other leading brands. We’ve dedicated a page to best diving watches on the market. Here you’ll find general information, sales advice and most popular models

Swiss Alternatives

If the Sinn brand appeals then please also consider a diver’s watch from either Doxa, Oris, Tissot or Longines. Like Sinn, the range of Doxa divers watches in underappreciated and sometimes even overlooked. Most popular in their dive watch collection are the Doxa Sub 200, the glorious Doxa Sub 300T (with no-decompression bezel timer) and, our favourite, the reborn Doxa 600T built from marine grade stainless steel.

Next we’d recommend a trip over to the Oris Dive watch collection. The most popular models in their dive collection are the Oris Aquis (WR to 300m – 1000m) and the Oris Divers Sixty Five (WR to 100m). A collection of competent timepieces with a product for all users from outdoor beach life (Oris Sixty Five) to full on professional diver (Oris Aquis Depth Gauge).

If nothing their grabs your attention then wander over to the more traditional, yet equally desirable range of dive watches from Tissot and Longines. Tissot is a brand with a long and intimate relationship with the sea and in particular – divers watches.

Most popular are the Tissot Seastar 1000 and the deep diving Tissot Seastar 2000 with Powermatic 80 automatic movement. Longines is another company with a long relationship promoting outdoor life, sports and adventure. Like Rolex, Blancpain and Breitling – Longines entry in to Diver’s watches goes back to 1959! The new Longines Hydroconquest is their most desirable timepiece. A watch dedicated to men and women who demand high end performance from their timepiece without compromising on technical innovation and elegance.

Sinn Watch Finder Service 🔎

ChronoDivers offer a free watch finding service. All SINN watches recommended by ChronoDivers will come with a Guarantee of Authenticity. We study the watch price charts dails and know what is a high, average, fair, good or even excellent price to pay for a SINN watch. Our payment for this service comes from a small percentage of affiliate commission at NO COST to either the watch BUYER or the watch SELLER. If you want ChronoDivers to help find your luxury watch get in touch today > click the image below and complete our simple online form.

FREE Watch Finder Service. Just tell us which watch you are looking for and we will do our best to find it - FREE


Does Sinn make good watches?

Yes, Sinn is a well-respected brand in the dive watch industry and is known for producing high-quality and reliable timepieces that are suitable for diving. Sinn’s dive watches typically feature robust construction, excellent water resistance, and legible dials with luminous markings for visibility in low-light conditions. Additionally, many of Sinn’s dive watches are equipped with features such as helium escape valves, anti-magnetic shields, and shock resistance to ensure durability and accuracy during challenging underwater conditions. Overall, if you’re looking for a dive watch, Sinn is definitely a brand to consider.

How much does Sinn U50 cost?

The price of a Sinn U50 can vary depending on the specific model and where you are purchasing it from. The base model Sinn U50 with a black dial and rubber strap had a suggested retail price of around $2,330 USD or £2,000 GBP (as of Dec 2022). However, prices may vary based on factors such as the material of the case and bracelet, the type of movement, and any additional features such as a date display or a different dial color. It’s best to check with an authorized Sinn dealer or retailer for the most up-to-date pricing information.

Are Sinn watches made in Germany?

Yes, Sinn watches are made in Germany. The company is based in Frankfurt am Main and all of its watches are designed, developed, and assembled in-house at its manufacturing facility in the city. Sinn prides itself on its “Made in Germany” production philosophy and places a strong emphasis on quality and precision in its watchmaking.

The brand uses high-quality materials and advanced manufacturing techniques to ensure that its watches meet strict standards for accuracy, durability, and reliability. As a result, Sinn watches are highly regarded by watch enthusiasts around the world for their craftsmanship and performance.

What is the difference between Sinn U1 and U50?

The Sinn U1 and U50 are both popular dive watches but there are some key differences between the two models.

Size: The U1 is a larger watch, with a 44mm case diameter and a thickness of 14.3mm, while the U50 has a smaller 41mm case diameter and a thickness of 11.2mm.

Water Resistance: The U1 has a higher water resistance rating of 1000m (3280ft), while the U50 is rated to 500m (1640ft). However, both watches are more than sufficient for recreational diving.

Design: While both watches share a similar design language and are built to the same high standards, the U50 has a slightly more modern look with a thinner bezel and a slimmer profile.

Movement: Both the U1 and U50 feature high-quality automatic movements with the same frequency of 28,800 vibrations per hour (4Hz), but the U50 is equipped with Sinn’s newer in-house SW 510 movement, which features a chronograph function.

Price: The U1 is typically less expensive than the U50, with a lower entry-level price point, while the U50 is a more premium offering with additional features and a higher price tag.

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