You could sell your baseball cards to a local card shop, knowing full well what they’re worth (because you searched for them on Mavin right?). It may be a good investment to get them professionally graded by PSA or BGS, this will dramatically increase their value. You could hold onto the cards and “collect” them, as most collectors do, and hope they appreciate in value over time. Once you’ve searched through your cards and found the valuable ones, you have several options: This gives you a much more accurate estimate of the value of your baseball card. The “worth” is the average value of the cards matching your search results… so if you get too many search results not like yours, make sure to refine your results by entering more card details, or pick a few comparable items by using the checkboxes to pick your “comps”. Mavin returns cards just like yours that have recently sold. Using Mavin to see what a baseball card are worth For example 1989 Upper Deck #1 Ken Griffey Jr
