It isn't found, that's my point. Read the last sentence again - "NGC assigns a wear or details grade to coins designated SHIPWRECK EFFECT C or better." What is in italics in my last post is taken directly from the NGC site. Go read it yourself - http://www.ngccoin.com/shipwreck-coin-certification/shipwreck-effect-designation.asp
follow this link to a shipwreck A (UNC) http://cgi.ebay.com/1861-O-50c-W-10..._Individual&hash=item2c55a0132a#ht_3571wt_873