Quite possibly an attempt at removing an engraving. Things happen to case backs- often the work of a coarse nylon strap, but this is different, and I agree with simpletreasures, that it might indicate someone's fully intentional interference with the watch, with sandpaper being the possible tool of such an interference.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
WatchUSeek Watch Forums
22.5M posts
575.5K members
Since 2005
A forum community dedicated to watch owners and enthusiasts. Come join the discussion about watch collections, displays, watch winders, accessories, classifieds, and more! We welcome all manufacturers including Casio G-Shock, OMEGA, Rolex, Breitling, Rolex and Tudor, Seiko, Grand Seiko and others.