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.
In reply to What does the R at the end of by William Smith
In reply to and the H? by mybulova_admin
In reply to Hack would get My vote. by FifthAvenueRes…
Current theory is that the "R" was indeed intended to represent Rail/Railroad. There are a fair number of pointers to this being its designated nomenclature. Its lack of becoming official as such, however, is the basis of a few different theories, all with varying degrees of support.