I have a ~100 year old Conn with a nail file G# key that's in good shape and plays well. It's apparently circa 1925-26 and has the markings: 1914 (which I assume is some sort of patent date); 1119954; T; M207031; L. Anybody have any idea what the history is or what this might be worth? I purchased it at Manny’s in NYC in the early 90s. Pictures attached. Thanks.