Did you find this thread from 2016 Bill?
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=448093Hopefully Mr. W Martin has made some progress since. You might send him a PM.
In
1895 he was on Renfield St. An undated gun with the Renfield address had SN A5547
He was on Bothwell St. in 1922
https://books.google.com/books?id=U25EAQAAIAAJ&pg=PA34-IA67&lpg I found one sold with SN H21393 listed as 1926 DOM and the case had the Bothwell St. address
SN 2452 and AK 153 had Waterloo St. address.
AK 56 with Waterloo address
https://www.gunsinternational.com/g...isp-rose-and-scroll.cfm?gun_id=101499552 According to Nigel Brown's
British Gunmakers, Vol. Two, Charles Ingram was at this address between 1924 and 1946.
Have you dated the proof marks?
Some images of "Old Charley" here
https://www.caingram.info/Ingrams/htm/charles_ingram_1816.htm
