[email protected] said
There’s a gun listed on GB 1004231281 that’s listed as an antique, but has proof mark on recvr. My understanding that started about 1905 or 6. If it was sent back for Repair would recvr be proofed?

  

More accurately, it has a Winchester proof mark stamped on both the barrel and receiver frame, which is what I would expect if the factory records show a “Repair & Return” entry.  Based on the caliber marking location on the barrel, it should have a “R&R” entry after 1907.  I most certainly would verify this gun through the CFM records office before considering at candidate for purchase.

As Don mentioned, the actual DOM is 1901 (September).  It is not “Antique”.

Bert