Casey & Co. Boxwood plow plane - XLNT!. Threads are virtually mint - one nut is cracked as shown in the picture. Casey & Co - Auburn, NY. The blade is marked OHIO TOOL CO. Auburn NY. I've done nothing to this plane other than to buff it up (by hand) with some #0000 steel wool and wax. All original finish ... threads run freely. One of the best I've ever found.