Hi Springer,
Thanks for replying. Very nice patina on your 1680! I guess your's would be the Mark III dial. What are the first digits of the case serial number on your watch?
As with Rolex, there's always overlap. There's currently a 5.4mil serial watch on e-bay with the Mark IV dial like mine and in the VRF dial archive there's a 5.8mil serial as well.
Kayvan
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