Auction Series 257-264 in Zurich Day 2

1911: Issued for Inland Postage only, 2 c. + 2 c. designs (H&G 54A) printed by the 'Comp. Sud-Americana de Biletas de Banco' in Argentina to coincide with First South American Postal Congress in Montevideo, 2 c. blue on straw, 2 c. violet on lilac, 2 c. deep blue on blue (two, one with 'stamp' at left), 2c. green on yellow and 2 c. pale blue on pink (two, one with 'stamp' at left), all are reply cards, fair to fine unused examples, some minor imperfections but a rare group H&G = unpriced.
Catalogue 257: EUROPE & OVERSEAS