taxing question

This has probably been answered in the past but how does everyone determine tax for items they bought years ago and don't have receipts for purchase price??? for example bought 1975 Topps set years ago...don't have receipt. sold for $200. is taxable income the whole $200 since I don't have any receipts??? or do you go by current market and determine whether you had a loss or gain???? if someone can direct me to a post about this THANKS!!
al.
al.
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