2 Different aerograms with marks of Jubany Antarctic station + icebreaker ARA Alte. Irizar + "Correo Despachado a Bordo" + helicopter mail, both pieces signed by Tte. Cámara, very nice
Cover sent from Petrel Antarctic station to Buenos Aires on 4/AU/1975, with arrival backstamp of 3/MAR/1976, on front it bears a handstamp of the station + "DECLARACIÓN CONJUNTA" cancel, very nice!