Air Mail cover 1914 (23 Nov.) blue Feldpost card carried to Krakau by favour of Captain Lehmann, put into the Fieldpost system on arrival and showing straight-line "K.u.K. Fliegerkompagnie Nr.11" lightly applied in violet, Fortress cachet in violet and "CSEKLESZ" arrival c.d.s. (28.11). A rare forerunner of the Siege flights. Photo