Guido RENI (1575 - 1642) (after) - Frontispiece to the work "Fonte prima d'Aritmetica", by Giovanni Battista Fontanelli. Etching engraved by an anonymous artist or a pupil of Guido Reni. Ref: Bartsch ill. 40, p.247, no. 35. Bartsch, Catalogue raisonné des estampes gravées à l'eau-forte par Guido Reni et de celles de ses disciples, p.49, n°30 (rare according to Bartsch). Proof on laid paper (watermark very difficult to read), covered on verso with a collection mark handwritten in brown ink "L. Longhi" (?) (Lugt not described). (21 x 13.5 cm for the engraving. 21.8 x 14.5 cm.) Condition B/C (Proof cut inside the copperplate mark, sometimes at the edge or inside the square line. Small gap formerly filled and redrawn at lower left corner. Very rare small stains and formerly doubled).