Homage to Henri Poincare, c.1913, a square silver plaque by G.-H. Prud’homme, half-length figure of Poincare studying books, reverse legend, SOUSCRIPTION INTERNATIONALE, etc., 44 x 44mm (PBE 783; BDM VIII, 147). Obverse very fine, reverse better; in original green velvet-lined case (£40-60)

Jules Henri Poincare (1854-1912), Professor of Mathematical Physics at the Sorbonne in Paris, the leading French mathematician of his day and the originator of algebraic topology