In my experience the toughest 80s Topps sets for me to assemble ( as listed in SCD), were the 82 Blackless, 84 Encased ( head in box prototype proofs), 85 minis in blank bank, regular back and red only back ( have not finished the red backs), the 88 Cloth and 89 Big Head Suckers . The 80 coins were the toughest but are not cards
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