The Santa Fe Hawken was made by Uberti, and to my knowledge has a different lock than the Navy Arms/Ithaca Hawken, the Uberti Santa Fe has a bent sear, parts for the Uberti are supposed to be available from Taylor and Co, but never seem to be in stock. Navy Arms sold other rifles labeled "Hawken", one brute .58 called the Hawken Hunter, and others, a picture would help pin this down.