Auction # 2433 ARGENTINA: San Martín (1917), including rarities!!

ENCASED POSTAGE STAMP: GJ.462, 1918 San Martín 5c. without watermark, encased by the drugstore FARMACIA FRANCO-INGLESA of Buenos Aires, extremely rare! They were used for advertising purposes and to compensate for the shortage of coins to use as change, very rare, no more than 10 examples are known!