The first 67 in the initial 990 cards come 3 ways. The ones with no MLB copyright are semi tough, mostly because it requires review of the back. The one with Hall Of Fame spelled out rather than abbreviated to HOF are easy to spot but hard to find. The promos and prototypes for each year were distributed like salesman samples. Some are pretty scarce. Four of the prototypes from 91 are really hard to locate because there were limited amounts printed and they are not stamped as promos but just lack a copyright line on the back. The site above is pretty good at laying out the whole “checklist”
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