C13, C14, flown covers, Lakehurst to Friedrichshafen, C13 on RPC of Eckener & Graf Zeppelin (light crease in card thru stamp), both w/ green Jun 18 1930 NY receiver, gen F-VF (Image)

Est. $200-300 LE

C18 Group of (4) diff flown Century of Progress covers franked w/ C18s, all on standard size env, each showing proper usage from Friedrichshafen to Rio w/ (1) C18, to Miami w/ (2) C18, to Chicago w/ (3) C18 & roundtrip w/ Blk/4 C18, Sieger #241A, 241C, 241E, 241G, single w/ light flap marks, otherwise gen VF (Image)

Est. $300-400 LE

C18, Group of (5) diff, all franked w/ C18s & each from diff official FD city, (NY Oct 2, Akron Oct 4, Wash Oct 5, Miami Oct 6, Chicago Oct 7) all flown covers except Wash DC, cond varies, Akron & Miami w/ light flap marks, gen VF (Image)

Cat. $1,175 LE