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ChiSoxFanDid a quick google on SGS GRADING COMPANY and found that there is one for grading coins. There site didn't say anything about grading sports cards (www.stargrading.org).
Also, looking through some other search results, I found a few articles of "buyer beware" as SGS Grading is "owned" by an eBay Power Seller.
ChiSoxFan
Looking for T206 Sweet Caporal Fact. #30 White Sox in Poor to Fair condition.