ID Request: Swiss-Made for German Market, Bought in Belgrade, Early 1900s?
Family heirloom that we're trying to identify. I've done some research and found that it is in fact authentic gold from the Squirrel stamps, and that the smaller one means it was made for the German market. The watch no longer has its hands, and the face is cracked. Haven't taken it to a jeweler or watch/clock shop yet, and would love to identify a maker if possible to see if it would be feasible to fix. The original cardboard box it was bought in indicates it was bought from a jewelry shop in Belgrade from a man named Antonije Rexor. Any information would be much appreciated!
Image 1: Front of Pocket Watch, "IVAN" inscribed in cyrillic
Image 2: Back of pocket watch, unidentified symbol
Image 3: Face of pocket watch, damaged and no hands.
Image 4: Close up of Authenticity stamps and serial number. This is on all 3 casings (front and back outer, and back inner)
Image 5: Crown Logo and indistinguishable initials below
Image 6: Clockwork with sapphires?
Image 7: Closeup of clockwork
Image 8: Writing on clockwork - SR, an arrow, and something else.