Taylor,
Many thanks for you help. That little gun was inspired by a 30 caliber Whitworth which according to Bill Curtis,only perhaps 8 are known to exist. Lynton McKenzie had one and I used the lock as a pattern/gauge for this one which I modified into a square tailed plate. I have made about 7 of these locks to correct pattern with the "4 pin" bridle for special orders.I may make another one of these little guns with the fancy lock. The lock on this gun is an ordinary American style with half cock and fly .
Thanks again for your help.
Bob Roller