Based on the part number, I believe this fits '59-'66 nailheads. 

The specific part number does not appear in my chassis parts book, but is similar to part nubmers from '59-'66 oversize sets. 

Inside part numbers are BT-10, RBT-10 and CS-50. Sounds like .10 oversize to me, but that's just a guess.

Rings are slightly tarnished, but should clean up well. 

Great original box would make an excellent display piece.