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Nice old Petzval lens with short focal lenght of appr. 160Mm and apertue of appr. F/3.5. Marked Derogy Brevete Paris&londres SN: 18278. With hood and flange without stops. Height appr 11cm. Diameter of front glass 46mm. Glass with minor edge separation. Some internal dust. Patina to lens housing.RoP smooth. We .....