One of my biggest beefs about the hobby. It goes on throught he 90s and 2000s. Not so bad when the stats are on the back of the card but with so many cards not having stats, it is very difficult to determine years of sets. Most of the time, I use the filter search by player for one card in the set to find what year and set it is from.
Of course, for those Bob refers to, probably not that easy.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0