The F prefix was used from 1989 through the end of 2002, and given the high number I'd say it would fall in the 1998-2002 range. Nothing really to I.D. as there was one and only one Model 24 in the latter years...the 24F. As for value, between the synthetic stock, the horrible triggers and the less popular break-open lever position on them the 24F's really aren't that sought after like the earlier models from the 60's and early 70's are. Maybe $350 to 400, possibly as much as $450 if you find someone who really, really wants one.