Disston key hole saw

I really shouldn't be out tool shopping right now. Well, kinda. I wanted a saw to restore for my cousin as a gift...and that one is kicking my arse at the moment. This little gem, however, jumped out of a basket at the store screaming, "take me home, I'm gorgeous." Why doesn't that happen when I'm out having a drink?
This is a Disston key hole saw. By my checking around, best I can figure is that it is pre-1875. It's seen better days, but is still a fine piece of work. The handle is super comfy, and is more befitting a dovetail saw. I'm likely to sell this, but not before I pattern the handle and take more pictures of it so that maybe one day I can reproduce it.