As you know, the 501SC was the scrimshaw designation. I am surprised to see that this one is not stainless. Perhaps none of the 501's were stainless, but most scrimshaws were indeed SCHRADE+ steel. The black handle with blank shield is exactly what we see in a number of issues sold to Sears Craftsman. I think it is possible that this one was put together out of leftover parts for the bankruptcy sale. Do you know what leftovers are called after the third day? Leftafters. Oops... sorry.