Sinn’s 613 St and 613 St UTC are mechanical diving chronographs with a 60-minute stopwatch display. The documented difference is that the 613 St UTC adds a second time zone shown on a 24-hour basis. Sinn’s English model-series document is dated February 2025; its catalogue describes the watches’ specifications but does not establish current pricing, regional stock or configuration availability.
What distinguishes the 613 St UTC?
Both models combine a chronograph with a diver’s bezel and a 60-minute stopwatch display. Sinn lists a 24-hour second time zone as an additional function on the UTC version. In other words, the UTC designation corresponds to a practical extra time-zone display; the supplied official material does not describe other functional differences between the two models.
Specifications at a glance
| Feature | Sinn 613 St | Sinn 613 St UTC |
|---|---|---|
| Movement | Not stated in the cited catalogue specification for this model. | Sinn specifies the SW 535, a self-winding mechanical movement with 23 bearing jewels and 28,800 semi-oscillations per hour. |
| Time and calendar functions | Hours, minutes, subsidiary seconds and date. | Hours, minutes, subsidiary seconds, date and a second time zone on a 24-hour basis. |
| Chronograph | 60-minute stopwatch display. | 60-minute stopwatch display. |
| Diver’s bezel | Minute ratcheting with a luminous key mark. | Minute ratcheting with a luminous key mark. |
| Pressure resistance | Sinn publishes 500 m (50 bar) and says the series’ pressure resistance was certified by an independent institute. | Sinn publishes 500 m (50 bar) and says the series’ pressure resistance was certified by an independent institute. |
| Case and crystal | Bead-blasted stainless steel; front sapphire crystal with anti-reflective coating on both sides; screw-fastened nickel-free case back and screwable crown. | Bead-blasted stainless steel; front sapphire crystal with anti-reflective coating on both sides; screw-fastened nickel-free case back and screwable crown. |
These specifications are from Sinn’s 2025–2026 catalogue; the company’s English model-series document says “As at: February 2025.” The movement details above are specifically listed for the 613 St UTC, so they should not be assumed for the 613 St without a model-specific specification.
What Sinn says about diving suitability
Sinn publishes water and pressure resistance of 50 bar, corresponding to a diving depth of 500 m, and says the 613 St series’ pressure resistance was certified by an independent institute. The company also states that the series was tested based on EN 250 and EN 14143, European diving-equipment standards, and cites DIN 8306 and DIN 8310 in its technical details. Sinn’s catalogue names DNV in its certification statement; these are the manufacturer’s published claims, not independent test findings presented here.
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- VK63 MECHA-QUARTZ CHRONOGRAPH: The WD1863 uses a VK63 mecha-quartz movement with a central 1/5-second chronograph hand, 60-minute counter, running small seconds and a 24-hour display. The pushers control start, stop and reset, combining quartz accuracy with crisp mechanical-style chronograph action for practical elapsed-time measurement.
- BUBBLE SAPPHIRE CRYSTAL & ALUMINUM BEZEL: The raised bubble-style sapphire crystal adds depth above the dial, while a high-clear inner AR coating helps reduce reflections. A 316L stainless steel case and bracelet provide a solid everyday build, and the fixed aluminum bezel creates a defined frame around the vintage chronograph display.
- SUPER BGW-9 BLUE LUME: BGW-9 super luminous material is applied to the hands, hour markers and selected dial details. After exposure to light, these elements produce a blue glow that supports quick time reading in darker surroundings. Coverage follows the individual dial design and remains clearly arranged around the three-register chronograph display.
- 100M WATER RESISTANCE: The screw-down crown and screw-down case back support a 100M water-resistance rating for daily wear and suitable surface-water use. Always tighten the crown fully before contact with water, do not operate the chronograph pushers while the watch is wet or submerged, and avoid hot water, steam and diving. Water resistance should be checked periodically as seals age.
- COMPACT 39MM WRIST PROFILE: The WD1863 measures 39mm across the bezel, with a 41mm mid-case, 46mm lug-to-lug length, 12.9mm thickness including the raised crystal and 20mm lug width. These proportions balance the detail of a three-register chronograph with a wearable footprint. The 20mm bracelet remains proportionate to the case, while the raised crystal adds vintage depth to the compact design.
The watches also have several features directed at durability and legibility in demanding conditions:
- Captive bezel: Sinn lists a bezel designed to be secured to the case.
- D3-System push-pieces: Sinn specifies this system for the chronograph push-pieces.
- Ar-Dehumidifying Technology: included in the published specification.
- Magnetic-field protection: Sinn states protection up to 100 mT (80,000 A/m).
- Low-pressure resistance: also listed in Sinn’s technical details.
What is not established by the published material
The catalogue information available here does not establish current prices, release timing, regional stock or which strap and bracelet configurations remain available. Although the catalogue shows different strap or bracelet configurations, that is not confirmation that every configuration is currently offered. Check Sinn or an authorized retailer for current market-specific availability and the exact reference before deciding between configurations.
Quick Recap
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.
Rank #4
- 200 M Waterproof: Designed for diving, swimming, and daily use, this men's watch offers reliable waterproof performance up to 200 meters (20 bar). The screw-down crown and case back ensure enhanced security against water ingress
- Japanese Movement: Equipped with a precise Japanese 2115 quartz movement and original Japanese battery, it provides reliable timekeeping with a three-hand display and date function for everyday convenience
- Ultimate Reliability in the Wild: Crafted from 316L stainless steel with a combination of brushed and polished finishes, the satineless steel watch features a unidirectional rotating bezel with 120 clicks, BGW9 luminous hands and markers, and a secure folding clasp for adventure
- Boasting a well-proportioned 41mm case, a 48mm lug-to-lug length, a 20mm lug width, and a 13mm profile, it fits most wrists comfortably. Paired with a 220mm stainless steel band and weighing 160g, it ensures a secure and comfortable feel all day
- Ideal Present: Featuring a rugged 3D desert-textured dial, this watch is built for exploration. Its hands and markers are coated with “sand-finish” lume that blends seamlessly with desert-textured dial by day and glows brightly at night. Versatile for office or outdoor wear, it’s a thoughtful present for holidays, anniversaries, and everyday use
Rank #3
- Swiss Quartz movement
- Flame fusion crystal; 18K gold ion-plated stainless steel case and bracelet
- Chronograph functions with 60 second, 30 minute and 12 hour subdials; Magnified date window at 4:00
- Champagne dial with gold tone, light blue and white hands and gold tone and white hour markers; Unidirectional 18K gold ion-plated stainless steel bezel and blue top ring
- Water resistant to 660 feet (200 M): suitable for recreational scuba diving
Rank #2
- Black dial chronograph with 60min, 60 sec and 1/10 sec sub dials, stainless steel band, screw down crown
- 43mm stainless steel case with flame fusion crystal
- Analog-quartz Movement
- Case Diameter: 43mm
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
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