Old Brass Clock Key - with Flat Blade on other end.
I don't know what kind of clock this goes to but I added a photo measuring the opening. The flat, screwdriver like end, has not of a curve that you can probably flatten. I'm selling it just as I found it, I've done nothing to change it.
The key you see in the pictures is the one you'll receive
Thanks for taking the time to read about this key