From what I've read, traps like this from the 18th century usually had a steel or wooden bar underneath the pan attached to devices on the circular frame to hold open the jaws and the pan placed on top of the bar. A shallow depression was excavated under the trap and when the animal stepped on the pan it would release the bar and spring the trap. I don't see anything to attach a bar to hold open the jaws on this trap.
Pan is detachable, wood bottom, light steel top.
2nd pic of Pan- there are two steel hooks on the underside (you can barely see in pic).
The logger set the trap for me and didn't watch close how he set pan, but it was set so I would say pan is in tact, and trap workable.
He or I didn't recognize the the last name on tag, but town is very local, in western Union County, Pa.. So I'm still asking around.
I did look it over. Found no maker mark.
Thank you folks for the information.
I'll update this fine, If I get any more info.
Thanks again.
Hern