Voigtländer Petzval Brass Lens 1852 No.5021 ca. 36cm 360mm

'Voigtlnder & Sohn in Wien und Braunschweig' engraved, with chrome mounting ring (recently made), hood (very hard to screw down), cap, focal length approximately 360mm (36cm), front and rear lens diameter c. 107mm, 31cm height with hood and cap, 12.8cm width, 18.5cm width with mounting ring, 5170 gr., with some dust specs and cleaning marks, tiny separation behind front lens.