AUSTRIA, 1931, February 2, Schmiedl V7 experimental rocket (Hopferwieser FS-08b)

AUSTRIA, 1931, February 2,   Schmiedl V7 experimental rocket (Hopferwieser FS-08b). Cover with 10g stamp overprinted by manuscript handwriting tied by violet  postmark "V7/(2.2.31)". Violet handstamp "V7/011"as well as handwritten text "Test flight carried..." with signature "Schmidl"addressed to Graz, signed Schmiedl, very fresh, i n perfect condition, very rare rocket flight from 1931. Violet postmark "V7/(2.2.31)" also in the back. Only 19 were flown. Extremely rare especially in this condition! , Hopferwieser €3000