Air Mail cover 1930 (19 Oct.) Hessische Glider flight, two covers, each bearing pair of the 25pf. vignettes tied by special c.d.s., one is the official cover, the other a pilot-signed envelope with cancellation and h.s. in violet (vertical crease); also official postcard with imprinted vignette, fine used. M. 20 DM. 1000+