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Somebody has gone into a lot of effort to shape it like a (British) WWII milit.watch. I've seen 30mm pocket watches in SC-version but not Rg-chronomètre. Your serialnumber 11'34 is actually surprisingly high in my opinion, most are somewhere between 9'8 and 10'5 M. Perhaps it used to be a very late Rg model exported to S.America, that for whatever reason lost it's casing and got eventually modified. It's history would be most interesting to know!
Simple and effective to fold that "horseshoe" downward when wearing: out of sight and it does not bother you. Enjoy!
Ciao, Ben.

