Auction # 2438 ARGENTINA: Special October auction

RARE COMBINATION: Registered cover sent from Las Breñas (Chaco) to Buenos Aires on 4/DE/1950 franked with 50c. consisting of 4 official stamps of 10c. Rivadavia (GJ.636) + definitive stamp also of 10c. Rivadavia printed on chalky paper (GJ.801), very fine quality, very unusual!