Not sure if this topic belongs here but if not ,mod,please put in correct area. I happened on a forum that is new to me but may be known to members of lockpick101. It is
www.antique-locks.com. It's a treasure trove of information and covers a lot of lock history. Try it.
"I dream of a world where, chickens can cross the road without having their motives questioned". Ralph Waldo Emerson