In the late 1980's, there was a DOS-based computer program to track your collection. You typed in the card info and it calculated the price from it's internal database. It was based on the grading conditions at the time (maybe ?) mint, vg-ex, f-g. It was advertised in SCD, baseball hobby news, Trader Speaks, etc,... and sold for about $100. Not sure if there is anything like that nowadays.
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