Ed,
I take it from the date you give for the Proof marks that the gun you are asking about is not the Gibbs and Pitt patent A&N that Skeettx has referenced from Gunbroker.
You do not provide photos or a serial number and without those you are simply inviting wild guesses.
You mentioned W&S and William Evans. W&S is quite likely as a maker, William Evans much less so.
If you really want to know, University of Glasgow hold the A&N records and as previously mentioned should be able to tell you from the serial number.
Last edited by Parabola; 12/30/22 08:51 AM.