1856/62, Estancos, 10c sky blue, the famous vertical block of 9 with adjoining diagonal bisect, full right sheet margin with marginal inscription "Es preciso colocar las estampas....", unused with original gum and hinge remainders, varying margins, touched or just cut into at upper left and foot, some creases, but mostly faint. The largest recorded block of this shade. Certificate Philatelic Foundation (1997)
Provenance: Joaquin Galvez (illustrated in his book 1964), 'Islander' (95. Corinphila,1996)
