hi out there....i purchased a hatfield 45 cal flintlock in the late 70's....trying to locate serial number, since i'm finally cataloging my collection...am i a total loser or what-can't find one...lock is case color case hardened with "hatfield" "warranted"...double set triggers...full curly maple stock, 45 cal on barrel, "for black powder only" on the barrel, "hatfield" on the barrel, octagon, browned barrel....can find no other marks....THANKS!!!!