My guess would be a railroad employee's numbered I.D. Token. I found one similar in a 100 year old railroad logging camp. There was sometimes a I.D. token issued to each man with a similar numbered token of the same number attached to the cookhouse table to identify your seat. Less confusion and kept freeloaders from getting a free meal.Found this today in northeast PA. I was hunting an area south of Towanda PA. Anyone have a clue what it is?