Auction # 2507 ARGENTINA: Philatelic gems, great and small, notable selection of classics!

RARE PAIR: GJ.9a + 9, 4Rs. chestnut, vertical pair with 2 varieties: the top stamp with the error "CUATO Ps" (GJ.9a) and the lower stamp with very notable PARTIAL DOUBLE IMPRESSION on the word "FRANCO" (variety not catalogued for this value!), excellent quality, very rare. With signature of Juan Mautalén on back