This Ithaca manufactured hinge pin - old style, flat measures 1.25 " long, .375 " outer diameter and is for the model M-66 Supersingle lever action single barrel shotgun in 12 gauge and is in very good condition with light slot wear. (file photo)

Note: Ithaca model M-66 Supersingle single barrel shotguns with the following serial numbers have been observed with this part: 17010, 30958 & 53451