Is it proofed for powder T? If so, that dates it post 1900.

My V20 was serial number 20,000 and change and was dated to 1910 by the name of the engraver who signed it. It wasn't his best work, as he was quite elderly at the time. These were some of the things Paul Bruchet knew about coming to a conclusion about a gun's build date.

I have no clue how you replace that.

Best,
Ted