Don't have much to add, but here goes...
Mine:
535, delivered about this time last year, AT000XXXX
464 straight grip, delivered a couple months ago, LA071XXX
695 bolt gun, old as the hills but not as old as the one below, 829XXX
135D-B, Grandad's gun made between 1950 and 1953, "We don't need no stinking numbers."
Kiddo's:
702 Plinkster, two years or three years old, EPA415XXXX
In other words, I'm not much help but I get to post my gats.