New member, old Model 19

[Cowcharge]

Hey all, this is my Model 19 NRA (#48369), that my dad gave me when I was a teenager. He bought it new back around 1940 or so, and shot competitively with it, and I've put a lot of rounds through it myself. It's entirely original, and has always been a tack driver. I was wondering if someone with experience in appraising these beauties could advise me on what condition this would be considered to be in, according to the accepted standards. I have no idea how to interpret "NRA finish 80", etc. And it's value, as well? Thanks!