cover -- 1934 Rock 1½d., neatly cancelled by Gibraltar Travel Key Slogan machine d.s. and used (18.11.36) to London; traces of yellowing in places, otherwise sound. Rare used. H. & G. 31, $250. Alos 1933 2d. letter card, bearing additional Rock 1d. cancelled by Travel Key slogan and used (9.7.34) to U.S.A. H. & G. 1, $75