JB - I'm confused again by your answer. I thought the "punch mark" indicated the reciever had been proofed and accepted for use. Multiple "punch" marked indicated rebuild and re-proof.
I note that the OP was asking about a 1903 receiver so my question now goes to 03-A3's (Rem. & SC). I have 4 Remingtons, all of which have the single "punch" mark. One of which I believe to be completely original and one that I know has been re-barrelled. I also have a SC (very late) that has been overhauled without barrel change (RIA stock Stamp (L/Rear) with one "Punch' mark on the receiver.
What gives??![]()