1936, Airmail overprints on fiscal stamp 3pts. rose, block of eight showing multiple varieties: top row "broken 1st O in CORREO", bottom row "Q instead of O in CORREO", on pos. 8 additionally "ESANA" instead of "ESPANA", mint original gum with hinge remnants, three stamps never hinged. Certificate Graus "Es pieza unica conocida". (Image)