Auction # 2305 ARGENTINA: Special February auction

GJ.748 + GJ.801, RARE COMBINATION of "Rivadavia 10c." stamp printed on different papers and with different methods franking a cover sent from Mar del Plata to La Plata. The 20c. postage is paid with a 10c. stamp printed in offset on imported unsurfaced paper (GJ.748) + another example on chalky paper, typographed (801), very rare, it is probably a unique combination!!