Belgium 1935  Rocket mail FFC. 10c. (Scott B166; Mi. 402, Yt: 407,; Sg:BE 683 )and imperf DUINBERGEN launch site Rocket Mail Cinderella  ( Bel:BE E8ND ) on 1935 local cover First Rocket Flight label tied by  special cachets, May 9, 1935. Reverse: UNIVERSAL INTERNATIONAL fair exhibition cinderella label vignette - 1935 BELGIUM Bruxelles Brussels / hall building cancelled w. 1935 BELGICA Rocket Mail cachet in black. Cover is numbered No. 35. very clean and nice.