I looked at a Sauer hammer drilling recently of unknown caliber. Marking on the rifle barrel is 108/49 which I hope means the "gauge" of the rifle. What caliber would that be?

Reported to be a "bring back" from the Great War. Has Prussian proof marks and no date code. Shotgun barrels are 16/1. Has a side lever opener. Top lever to left for the rifle barrel. Back action locks. Serial number 844XX which should be about 1900. Sorry, didn't have my camera with me.

Jeff