Sinn has a pretty epic history when it comes to diving chronographs, often playing by their own rules in ways designed to appeal to a very specific subset of the market. Their design ethos is straightforward and almost brutal in nature, but delivers a rarely seen level of focus when it comes to complications. Their latest entries into this genre are a set of 613 St watches, and they build on a concept first used in the EZM13 and EZM13.1 references, which boasts a 60 minute chronograph totalizer located at 6 o’clock serving as the focal point. Unlike those mission timers, the new 613 St watches bring the crown back to the right side of the case, and use a reverse panda configuration.
The diving chronograph is a tricky concept to get right, and Sinn takes a unique approach to the idea by stripping away all but the most essential elements to keep a high level of focus on utility. Sinn created the standard bearer of the genre with the original EZM1 back in 1997, and it’s an idea they’ve been building on since. The EZM13 used the same lefty configuration of the EZM1, but split the minute totalizer into a single oversized sub dial at the bottom of the dial. The running seconds hand was relegated to a small sub dial rendered in grey so as to not interfere with the more important timing elements. Even the date situated at 4:30 used red printing so that it wouldn’t be visible at a quick glance.
The 613 St builds on this layout, though makes a few welcome changes without altering the personality. The 60 minute totalizer now gets a white background, providing some contrast for greater legibility. Further, they’ve swapped the crown back to where you’d expect it along the right side case wall. The non-UTC variation even brings a day of the week display to the dial, placed next to the date at a more traditional 3 o’clock position, making it a more broadly practical watch than the laser focused mission timer.
The 613 St UTC brings a 24 hour hand to the dial, though it’s been rendered in light grey to keep focus on the pure white hour and minute hand. This variation also ditches the day of the week, keeping just the date at 3 o’clock. Here, we also find 24 hour scale moved to the inner portion of the dial, ala the original EZM13, though rather interestingly, the zero hour is at the bottom of the dial, with the 12 at the top, allowing it to align with 12 o’clock high noon.
Each of the new references use a 41mm bead blasted steel case, and each measure 15mm in thickness, so like the EZM13, they will each have plenty of presence on the wrist. Along the lug wall you’ll find the aperture giving a status of the Ar‑Dehumidifying Technology, beginning in light blue, and fading as it accrues moisture over time.
The UTC feels like the more tool oriented of these watches, though the clean, practical approach with the St feels like a more broadly approachable EZM13.1 in nature thanks to the more traditional crown position, and use of a reverse panda design. Both use Sellita based movements. These are still very Sinn watches in nature, however, which means a very peculiar personality at work that enjoys a narrow but deep appeal within the enthusiast space. The 613 St UTC on bracelet is priced at $3,870, while the 613 St on a rubber strap is priced at $2,860. Sinn
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