C18 (6), all w/ purple Century of Progress flight hs cachet, incl from Akron, from Miami w/ printed cachet, from Chicago, from Friedrichshafen (3) w/ red flight hs cachet; Chicago & (1) Friedrichshafen light foxing, (1) Friedrichshafen faded cachets, otherwise F-VF (Image)

Est. $150-200 LE

Group of (14) flown Century of Progress cvrs, all franked w/ C18 baby Zepps, all w/ proper markings, (2) w/ printed cachets (Linprint, Ioor), (7) are FDCs; all addr, from Friedrichshafen, Akron, Miami, Chicago, NY; some w/ multiple stamps, some light flap marks, gen F-VF (Image)

Est. $600-800 LE