Hi.......see if the trays have a date. They should also state "Made in USA, American Artworks". If yours are original in excellent condition they should retail in $350-$400 range. There are a lot of reproductions. I don't know what Clemente card you have. If it's a Topps, 1969, you can buy it for about $40. Earlier years can double that or more...........
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best............... .......Tim
"The difference between 'involvement' and 'commitment' is like an eggs-and-ham breakfast: the chicken was 'involved' - the pig was 'committed'."