Auction # 2423 ARGENTINA: Special auction for the end of the first semester!!

VERY RARE COMBINATION of stamps of 1P. Map without borders on DIFFERENT PAPERS: Commercial cover sent by airmail from Buenos Aires to New York on 27/AU/1943 with 7P. postage paid with 4 stamps printed on IMPORTED UNSURFACED paper (GJ.761) + 3 on CHALKY paper (GJ.770), probably unique combination, great rarity for the specialist!