This is the Deluxe edition of Derriere le Miroir nr. 198, with an article by Louis Aragon obout Chagall, entitled "L'Admirable". In French, of course.
In includes 3 original lithographs by Chagall on thick paper, which absorbs the colours much better than the paper of the normal edition. There were only 150 copies of this Deluxe edition. This book was not numebred.