Chambers locks are unmarked, unless their builder puts a personal mark on it. They know if they built
it or not, as they know HOW they build them. Also, on that Chambers Golden Age Lock, if Chambers built
it, the hammer retaining screw will have a rounded head, instead of the normal squared/beveled edge one.
Besides, if Dunlaps said it is a Chambers, it will be a Chambers lock.....
Keith Lisle