Monaco, 1933, Bloc de 15 timbres du Poste Aérienne Y&T n°1 1f50 sur 5f vert et rose-lilas comprenant 15 essais de surcharges différentes mention manuscrite "bon pour tirer" en marge au crayon rouge, neuf **, pièce superbe et unique, grande rareté de la poste aérienne. EXCEPTIONNEL. Certificat Calves (1995).
1933, Block of 15 Y&T No.1 airmail stamps 1f50 on 5f green and lilac-pink paper, including 3 original overprints in black, brown, and red, and 12 proofs of different overprints + handwritten “bon pour tirer” note in the margin, mint ** with gum, Calves certificate (1995), superb and unique item, a great rarity in airmail.
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