Auction # 2446 ARGENTINA: Special December auction

Interesting cover/lettersheet of Hotel Estancia Golf sent from Ascochinga (Córdoba) to Buenos Aires on 11/JA/1972 franked with 25c. There is an inscription printed on front: "Autorizado Dirección General de Correos de Argentina, Note 779-F, Exp. 38.571-SC/65", on back and inside it has images and advertising for the hotel, rare!!