No preference - need them to be pretty clear (fronts and backs) but also not so big in size that they are unwieldy in quantity. Whatever you have for now is fine - its more challenging to find quality scans and even harder to find them in raw form (not scanned through a graded case). In general raw and about 3-4mb is preferable but ill take what i can get for now. Thanks! Im going to do this one narrow use case and then see how much interest there is and potentially expand to other sets and loose grade attributes if there is enough momentum to rationalize an actual business beyond a simple POC...
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