Gottfried Leibnitz German Physicist c. 1850's fine India Proof engraved portraitLeibnitz. (Old Prints, 19th Century Prints, Proofs, Portraits, Scientists, Philosophers, Physicists, Gottfried Wilhelm Leibnitz). Issued c. 1850's, London by the Society for the Diffusion of Useful Knowledge. Beautiful mid 19th century stipple engraved mounted "India Proof." A beautiful rich dark impression. Bottom left of the sheet is seen the word "proof". Nice looking example, pleasing age patina, light minor scattered spotting, any minor age flaws