As thawk said, the 497 was one of the "Benchmade '49ers". It came with a leather washer handle as the 497L, and with a Staglon (Delrin) handle as the 498S. They were introduced circa 1973 as updated versions of older fixed blade patterns, the 497's ancestor being the 147. They came in a box marked "Benchmade" with a squared sheath embossed with the "'49ers" emblem.
Michael