Once again this shows that you are indeed a craftsman! Wonderful.

I can come fairly close to your serial number situation. My 500/450 3 1/4" Hollis was built in 1906. Another gent here in town came up with another Hollis 500/450 3 1/4" only 3 numbers away. What's the odds that over 100 yrs later on they'd show up together again in the same rack at the range in this part of the world?