These are a very rare find, American-made tuning machines made for Gibson F-style mandolins back in the day. The Kluson set, judging from the type of gears, is probably from the 1940s; the Waverly (bass side only),...

I’ll bet a bunch of you out there know exactly who made this and what it’s from; what I know is that it’s rare, it’s American-made, and it's from a top-grade American 1910s-30s guitar; I just can’t remember where I’ve...