I found an ebay listing for a note certified by C.G.C. (Currency Grading & Certification, Inc.) Does anybody know anything about this service? Are they credible?
They are a comic book grader, but I don't know of them grading paper money. PNG is the respected TPG of paper money.
Found several CGC graded notes on ebay. They seemed way overpriced. I couldn't really evaluate the accuracy of the grading because the pictures weren't good enough.