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boxingcardmanSGC has established itself as a prewar card expert service. Asking about a 1972 Topps set in SGC holders is outside that niche. Makes as much sense as my asking how long it would take me to assemble a PSA graded set of Exhibit boxing cards. Answer: forever, because PSA doesn't grade Exhibit boxing cards, according to their submittal guidelines. If you are looking for a slabbed set from the 1970s, PSA is your place.
I think it is perfectly valid to ask for better customer service from a company you deal with and, frankly, I stopped sending cards to PSA years ago shortly after SGC came out because I could not stand being treated like gum on PSA's shoes for my troubles.