How accurate are those guides?
I stopped using guides 8 yrs ago or so. All I have is the national SMR which is WAY off for the cards I watch ie 1915 cobb psa 2 per smr is $900...one just sold on ebay for $5200. I developed my own proportion system relative to other cards in the set and hawk ebay and other sites...I do get burned on rarer cards at times though.
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