Signed l.l. in graphite; numbered 11/30 l.r.; monogrammed in the plate; label verso; On the back: etiquette: The Large Glass etchings, Summer 1965, 8 etchings, first estate printed on Japanese vellum from a series of nine etchings representing details of the large glass and related works, vol. 1 by Arturo Schwarz. Each inscribed lower left in pencil: Marcel Duchamp exhibited: Marcel Duchamp: the Art of making art in the Age of mechanical reproduction, Achim Moeller Fine Art, New York, 20 october 1999- 15 January 2000, cat. No.107 - Etiquette: M. Duchamp: 15 sept. 15 Dec. 1991: The Oculist witnesses 1965, Coll. Ronny van de Velde Litterature: The complete works of Marcel Duchamp, par Arturo Schwarz, editions Delano Greenidge 2000, New York ,p.859, no. 627a.