Waterproof Case measures 42mm lug to lug x 34.5mm non inclusive of the Crown using Calipers. Oversized Crown. An anti-magnetic shield appears between the Caseback and Movement. Stainless Steel Caseback screws on and is stamped as shown. rare bird.
Military style Star Case. 23 Jewel Chronometer. Hackset for synchronization.Sets and ticks, will not wind - visible damage to the ratchet wheel.