Lot 50625 – Switzerland, Neuchatel – 1851 Poste Locale 5c, cliché

Switzerland, Neuchatel – 1851 Poste Locale 5c, cliché on celluloid in opaque grey and with reversed image, an important documentation of Sperati’s two-stage printing process for this issue, dated “7/49” and showing rich manuscript comments about the reproduction process and the use of natural and artificial light.