Auction # 2506 WORLDWIDE + ARGENTINA: Special auction Punta del Este Exposition

GREAT RARITY: Registered airmail cover sent in early May 1931 from LAGO BUENOS AIRES (Santa Cruz) to Buenos Aires, total postage 60c. with an extremely rare and almost unknown circular cancel in negative with the inscription "LAGO BUENOS AIRES - CORREOS - REP. ARGENTINA" appled several times over the franking and also on back. It bears transit mark of Puerto Deseado 6/MAY and arrival of 15/MAY, excellent quality, unique and unrepeatable piece of airmail in Argentine Patagonia!