77/ 554 Zwart, P. [N.K.F.]. "Vulmassa voor telefoongarnituren in verschillende hoedanigheid (...)". Advertisement, 1931, 14,8x21,1 cm., recto w. letterpress text, verso blank, tipped onto grey paper mount along left and right margin.

= Dated "25.11.31 + 9.12.31" in pencil on verso mount by Kees Broos. PROOF.