Wanted 20.5" Marin Pine Mountain 92, 91 frame & forks

how do you tell the year from the frame number? I have what I think is a 1992 Pine Mountain frame and forks but don't know the size. Quite large.
 
Yes these are 1992’s really nice mate, ideally I need a 21.5 inch pine mountain ..so tempted go for this 19”..how much would you be looking for?
 
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