Roger VIEILLARD (1907-1989) The Dialectician, 1977, trial proof Sculpture. Brass proof. Signed VIEILLARD, numbered EE/150 and dated 1977. H. 17 cm Bibliography : Anne Guérin, with the collaboration of Virginie Rault - Roger Vieillard - Catalogue raisonné, œuvre gravé 1934-1989 - Éditions Anne Guérin / Somogy Éditions d'Art / Musée de Gravelines, Paris / Gravelines, 2003. The model is listed among the artist's medals published by the Monnaie de Paris, page 903; the engraving of the model, entitled Les Philosophes, is referenced under number 611.