SINN 910 SRS – The Ratchet Wheel Chronograph with Flyback Function

Presented at Baselworld 2018, the 910 SRS watch from SINN is a traditional ratchet wheel chronograph with equipped with flyback function.

The flyback function allows the chronograph’s hand to be stopped, reset to zero, and restarted by pushing the reset button at 4 o’clock. The continuous stop-seconds hand in particular can be reset to zero with the single push of a button and instantly restarted without losing time. The advantage of this is accurate time measurement down to the last second of consecutive time intervals.

The time on this watch is stopped by a traditional ratchet wheel chronograph. The ratchet wheel chronograph is a complication of sophisticated craftsmanship, with a tradition dating back to the mid 1900s when the ratchet wheel control mechanism was a key component in traditional chronographs.

Such a complication is extremely complex to produce and requires the utmost care and precision in assembly. Since the ratchet wheel controls the start, stop and reset functions, it is subject to high levels of stress. The highest possible resistance to wear and tear is required in order to make full use of the benefits, for example an easy-to-operate push-piece.

Attached appliqués and polished, shiny chamfers on the counter rings, which correspond harmoniously with the polished glass rim, underline the high-quality aesthetics of this timepiece. The 910 SRS also features a fine, exquisitely decorated movement, which can be admired through the transparent back made of sapphire crystal glass.

Technical details 

Mechanical Movement Valjoux 7750 Flyback
Self-winding mechanism
25 bearing jewels
28,800 semi-oscillations per hour
Seconds stop function
Shock resistant as per DIN ISO 1413
Anti-magnetic as per DIN 8309

Case made of stainless steel, polished/satinised
Sapphire crystal glass in front, anti-reflective on both sides
Transparent case back made of sapphire crystal glass, anti-reflective on the interior
Case back screw-fastened
Meet the technical requirements for waterproofness, as set out in standard DIN 8310
Pressure-resistant up to 10 bar
Low pressure resistant

Hours, minutes, subsidiary seconds
Chronograph with flyback function (SRS = Stopp-Retour-Start)
Double scale for measuring units per hour (e.g. kilometres)

SINN Technologies
Crown and push-pieces with D3-System

Dimensions and Weight
Case diameter: 41.5 mm
Band lug width: 22 mm
Case thickness: 15.5 mm
Weight without strap: 89 gramme

Dial and Hands
Attached appliqué

2 years

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.