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Lot 1011

épreuves de luxe and blocs spéciaux (18 ex.) including BF4 Conférence de Paris ** (lightly toned gum). Ep Yv. no. 762, BF 7, congrés de I'U.P.U **, Ep. Yv. no 881 in various colours. Ep. Yv. no. 889 etc. fine/very fine