The Oberndorf serial number is 24482 and it has the crown over B and crown over U proofs on the left side of the front receiver ring. A Mauser expert dated the action to circa 1905. I wonder what happened between then and 1926 (besides WW1) when the barrel was proofed. The serial number on the magazine, the bolt and the rest of the parts is 57822 (22 on the small parts). Does this mean that this is a parts gun or did Mauser serial actions and other parts separately?