Model 657

The pilot's watch with the captive rotary bezel.

Special characteristics Description Technical data

Information

Case made of stainless steel, bead-blasted
Magnetic Field Protection up to 80,000 A / m
Captive pilot's bezel with minute ratcheting
Sapphire crystal glass
Nickel-free case back
Pressure resistant to 20 bar (= 200 m water depth)
Low pressure resistant

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Based on the 656 model range, and designed as a functional instrument watch in the tradition of our cockpit navigation clocks, this pilot's watch also features a pilot's bezel which permits its wearer to measure or check set time intervals.

This is a decisive criterion particularly in aviation — reason enough for us to give this important function a superior design.

The stainless steel pilot's bezel with minute ratcheting can be rotated on both sides and features a special mechanical system developed by Sinn to protect against loss.

The labelling is silver on an inset, black anodised aluminium ring to ensure optimal scale readability. A luminous triangle serves as the 0 / 60 minute mark.

Mechanical Movement
- ETA 2824-2
- Self-winding mechanism
- 25 bearing jewels
- 28,800 semi-oscillations per hour
- Seconds stop function
- Shock resistant as per DIN 8308
- Anti-magnetic as per DIN 8309

Case
- Case made of stainless steel, bead-blasted
- Sapphire crystal glass in front, anti-reflective on both sides
- Case back screw-fastened, nickel-free
- Crown screwable
- Water-resistant as per DIN 8310
- Pressure resistant up to 20 bar (= 200 m water depth)
- Low pressure resistant