SWITZERLAND 1935, JULY 27, 1935 1st Swiss Rocket Flight Säntis (Hopferwieser GZ-06b)

SWITZERLAND 1935, JULY 27, 1935 1st Swiss Rocket Flight Säntis (Hopferwieser GZ-06b) with with perforated red vignette stamped "ZUCKER RAKETE SAENTIS FLUG 27.JULI.1935" and a second red cachet stamp next to it, as well as the signature "G. Zucker", addressed to Wasserauen. Signed G. Zucker.   The envelope has a vertical fold  otherwise in VF condition. Hopferwieser 320 Euros.