Airmail, 1930, Graf Zeppelin Complete, o.g., never hinged, each with exceptional centering amid large well balanced margins, rich vibrant color on bright paper, simply a Superb set; 65¢ with 2014 P.S.E. Graded certificate (Superb 98); $1.30 with 2012 P.S.E. graded certificate (Superb 98), and $2.60 with 2006 P.S.E. Graded certificate (Superb 98), SMQ $9,050. Scott No. C13-C15  $1,900. AN OUTSTANDING MATCHED GRAF ZEPPELIN SET OF MINT NEVER HINGED SINGLES GRADED SUPERB 98 THAT WOULD BE DIFFICULT TO DUPLICATE. $0 (Image)