I have #N220xx. The model stamp 5 is clear,but may have something under it,7 appears to be stamped over a 9. Then a third digit,looks like an 0 stamp over something. Any ideas?? THANKS, Randall
There is no S & W model 590; it may have been originally stamped 29 or 520 and was assembled into a 57 instead. Also, some 57s were stamped 57-0 for no known reason.