The Sinn U15, U16 and U18 are three separate 1,000-piece automatic dive-watch editions whose cases contain steel recovered from the decommissioned German Navy Type 206 submarines sharing their names. The 41 mm U15 is the compact 500 m model, the 44 mm U16 reaches 1,000 m, and the U18 is the thickest and deepest-rated model in launch coverage at 2,000 m.
What makes the steel genuinely “submarine” steel?
Sinn’s catalogue describes these watches as “Made of steel from the like-named U 15, U 16 and U 18 type 206 submarines.” This is more specific than using a newly produced alloy designed to meet submarine specifications: the material is presented as steel that served for decades in the named vessels.
Sinn’s standard U-series submarine steel is a special grade developed by ThyssenKrupp for Type 206 and Type 212 outer hulls. For the U15, U16 and U18 anniversary editions, the official product material describes “high-strength, seawater-resistant German Submarine Steel from the decommissioned U 15 and U 16 submarines.” Each watch therefore has a direct material connection to its namesake boat, rather than only a naval-themed design.
U15, U16 and U18 compared
| Model | Case size | Depth rating | Movement and reserve in launch coverage | Edition | Reported launch price |
|---|---|---|---|---|---|
| Sinn U15 (1025.010) | 41 mm × 11.2 mm | 500 m | Sellita SW300-1; 56-hour power reserve; 25 jewels | 1,000 pieces | €2,990 |
| Sinn U16 (1026.010) | 44 mm × 14.7 mm | 1,000 m | Sellita SW200-1; 38-hour power reserve; 26 jewels | 1,000 pieces | €2,990 |
| Sinn U18 (1028.010) | 41 mm × 15.5 mm | 2,000 m in launch coverage | Sellita SW200-1; 56-hour power reserve; 25 jewels | 1,000 pieces | €3,230 |
The Sinn product sheet independently confirms the U15’s 500 m and U16’s 1,000 m ratings and says testing followed European diving-equipment standards with certification by an independent institute. The 2,000 m U18 specification comes from launch-review coverage; check the current official Sinn listing for the latest published rating.
#1 Best Overall
- Solar powered quartz movement helps reduce frequent battery replacement.
- 300M water resistant design supports swimming, snorkeling, diving, and water sports.
- Luminous hands and markers improve readability in dark or low-light conditions.
- Durable case and mineral glass are built for outdoor and everyday wear.
- WATCH SIZE & WRIST FIT: Features a 45.8 mm (1.80 in) case diameter and a 51.4 mm (2.02 in) lug-to-lug length. The adjustable 24 mm silicone strap accommodates wrists up to 230 mm (9.1 in). Measure your wrist and check the case dimensions before ordering, especially if you have a smaller wrist.
Which model is smallest, deepest or easiest to wear?
U15: the compact choice
At 41 mm wide and 11.2 mm thick, the U15 is the least imposing of the three. Its 500 m rating is already far beyond ordinary recreational-diving requirements, making it the natural choice if case size and everyday wear matter more than maximum rating. It uses the Sellita SW300-1 and has the longest stated reserve among the two U15/U16 launch specifications at 56 hours.
U16: larger case, 1,000 m capability
The U16 expands to 44 mm and 14.7 mm thick, with a 1,000 m rating. Its Sellita SW200-1 is listed with a 38-hour reserve and 26 jewels. The additional diameter and depth rating make it the most overtly tool-watch-like option, but also the largest on the wrist.
Rank #2
- Classic Style: rotatable bezel function with 120° unidirectional rotation, Japanese quartz movement with date function, enlarged date window at 3 o'clock, rotatable bezel, can be used as a chronograph or second time zone timer.
- Dimensions: Case Diameter: 41 mm; Case Length: 48 mm; Case Thickness: 13 mm; lugs width : 20 mm; Watch weight: 163 g; Watch length: 220 mm
- Detailed Components: screw-down crown, mineral glass dial window, stainless steel bracelet, adjustable bracelet (included tool to remove the bracelet links), security folding
- 200M Waterproof: It can protect your watch, you can use it underwater in rainy days with peace of mind
- Easy to Read Face :Simple dial design, easy to read the time, with luminescent function, the time can be clearly seen in the dark place
U18: deepest rating and thickest profile
The U18 keeps the 41 mm diameter of the U15 but measures 15.5 mm thick. Launch coverage rates it to 2,000 m, the highest figure associated with this trio, and lists a Sellita SW200-1 with a 56-hour reserve and 25 jewels. Its compact diameter does not make it slim: the U18’s height is greater than either sibling’s, so wrist clearance and cuff fit deserve attention.
Shared diver design
All three watches use dark-blue bubble-pattern dials, luminous hands and markers, sapphire crystals with anti-reflective treatment, steel H-link bracelets and captive rotating dive bezels. They are automatic mechanical divers rather than quartz instruments. The common design language links the editions, while the dimensions, movement specification and depth rating create meaningful differences between them.
Rank #3
- Smooth Sweep Seconds Hand: Powered by the accurate Japan VH31 movement, this watch features a distinctive smooth-sweeping seconds hand that mimics the motion of high-end automatic watches, all while offering quartz convenience and reliability.
- Exquisite Craftsmanship: Both the case and bracelet are crafted from 316L stainless steel, exuding a premium feel. The crystal is made of robust sapphire crystal glass with an anti-reflective coating, providing excellent clarity and scratch protection for everyday use.
- Professional Water Resistance: With a proven 200-meter (20 ATM) water resistance, a screw-down crown, and a screw-down case back, this watch is your perfect companion for swimming, snorkeling, and serious diving.
- High-Visibility Ceramic Bezel: The 120-click unidirectional rotating bezel offers a crisp and clean rotation feel, and is equipped with a full luminous ceramic insert to ensure accurate timekeeping, allowing you to easily keep track of your dive time even in the dark.
- Super Luminous Watch: BGW9 luminous material on the hands, markers, and bezel gives you that strong blue glow that lasts through the night. Easy to read when you wake up or in low-light conditions.
- Choose U15 for the smallest case and a 500 m rating.
- Choose U16 for the largest diameter and a 1,000 m rating.
- Choose U18 for the reported 2,000 m rating, accepting the 15.5 mm-thick case.
Prices, availability and what to verify
Launch coverage reported €2,990 for both the U15 and U16, and €3,230 for the U18. Later Japanese Sinn retailer pages listed the U16 at ¥814,000 and the U18 at ¥880,000. A separate regional search result showed the U15 as sold out.
Those figures are observations tied to particular markets and dates, not a universal current price or proof that any edition remains available. Before ordering, confirm the current stock status, local taxes, warranty terms, bracelet sizing and delivery arrangements with Sinn or an authorised dealer. Regional pricing can also reflect currency movements and import costs.
Rank #4
- PREMIUM DESIGN:NH34 Automatic GMT diver's watch featuring a blue and red rotating bezel, black dial with luminous markers, and date display at 3 o'clock position
- MOVEMENT: Self-winding automatic mechanical movement with GMT function for tracking multiple time zones
- CONSTRUCTION: Stainless steel case and jubilee-style bracelet with secure folding clasp for durability and comfort
- WATER RESISTANCE: Professional diver's watch rated for underwater use with 200m water resistance capability
- VERSATILE STYLE: Classic dive watch aesthetic with red GMT hand and two-tone bezel makes it suitable for both professional use and daily wear
Are these interchangeable watches?
No. All three share the recovered Type 206 steel concept, 1,000-piece production run and blue-dial diver format, but they serve different priorities. Compare the actual case dimensions, stated depth rating, movement and reserve, wrist fit, price and the provenance appeal of owning steel associated with the corresponding submarine. The U15 is the most compact; the U16 is the broadest; and the U18 offers the greatest reported depth rating while being unusually thick for its diameter.
The Bottom Line
The U15, U16 and U18 are distinct limited-edition Sinn divers made with steel from their namesake Type 206 submarines. U15 prioritizes compact wear, U16 combines a 44 mm case with 1,000 m resistance, and U18 delivers the deepest reported rating at 2,000 m in the thickest case.
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Best Value
- AUTOMATIC DIVE WATCH: This sterile version dive watch is from Addiesdive MY-H3-2 automatic dive watch with Japanese mechanical movement NH35A. It is water resistant up to 20 bar and can be immersed in water.
- DIMENSIONS: 41 mm diameter,13.5mm thickness,20mm strap width. The total length of the watch is 220mm. The double buckle of the safety belt has 3 micro holes and the length can be adjusted easily.
- MATERIAL: Premium 316L stainless steel is highly anti-corrosion, 120 clicks unidirectional rotating ceramic bezel, C3 luminous hands and indices and BGW9 luminescent ceramic bezel will help you see the time easily in dark or under water.
- PERFECT GIFT: This watch is without logo but with good quality and nice looking, perfect gift for the watch fans and your husband, father and son.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
