APOLLINAIRE (Guillaume). Le Flaneur des deux rives. 2 posters on long paper, 500 x 300 and 637 x 340 mm, folded. Very rare bookstore posters advertising Guillaume Apollinaire's book, "Le Flaneur des deux rives", published by La Sirène in 1918, the year of the author's death. One is a proof, perhaps unique, with "Apollinaire" mistakenly written with two "p's", one of which is crossed out with a pencil, and with a blank square in the centre, and the other is a definitive copy on better paper with the publisher's logo in the centre. No other copies of either poster have been found. Folded copies, very well preserved.