I've been trying to find manufacturing date info on the J.H. Bunnell key ("J.H. Bunnell&Co" is stamped on top of the frame), but it seems to be somewhat unique. Most J-38 keys that I've found online have a binding strap that is bolted to the top of the frame, but this one is bound by the LINE binding post instead.
On the bottom is a white stamp that seems to show "SC 16 k", I'm not sure about the "k". So maybe 1916, or maybe this key has a bakelite base stolen from another manufacturer?
Appreciate any help identifying this key.