Originally Posted by Jim K
It is pretty defiinitely a Kerr, or a copy of one. Kerrs were made by the London Armory Co. and should have English proof marks. Since that one does not seem to have them, I think it is probably a copy, probably Spanish and converted to cartridge.
Here is a link that shows a nearly identical gun with an ejector added:
Thanks for that. It definitely looks the same from my poor images off my phone.
I rang my friend to ask if there were any further identifying marks he could see easily and the number #2236 is stamped on the underside of the barrel.
Does that help narrow anything down?
I'll be seeing him again in the next few days and I'll take much better photos with my camera as suggested by jack404