Darlot Brass Lens

approx. 24cm focal length, brass Petzval lens with rack and pinion focusing, clean lenses, depending on the orientation it can either be used as a landscape or a portrait lens, barrel engraved 'ANCne Mon JAMIN DARLOT Sr OPTn Bte S.G.D.G. 14, r. Chapon, Paris, Visa Portrait Visa Paysages' (portrait or landscape), push-on brass aperture engraved 'Via-à-Portrait No 2', cap, front lens diameter c. 5.5cm, rear lens diameter c. 6.5cm, total height incl. hood: 16.5cm, very rare original maker's box marked 'Mon JAIMN DARLOT, Sr PARIS'