you can get the model info off of some items - like the ratchet, then look up the tooth count and dates
New Dual-Drive 72 teeth (1/4 drive) and 80 tooth ratchets (3/8, 1/2 drive) have no screw heads showing on the top of the ratchet (the side with the selector switch and the Snap on name).
7-series ratchets (F720, etc) have cap over gear in head; are 20 teeth (some are 30 tooth) - F71G 1970-1978
8-series(F830) are 30 teeth
9-series(F936) are 36 teeth
Dual-80 (80 teeth; 72 teeth in 1/4”) starts ~ 2005