Just to chime in ALR is a great resource for all things rare and topps. A proof esp those that have topps certs from vault or auction sell for more than blank backed cards that came from packs. That said blank backed and wronged back topps from the 50's 60's and early 70's are scarce. A May's blank back should attract attention from player and error collectors if it shows up for sale or in an auction. The others will find buyers as well. Hope this helps
Jonathan
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