Portrait lens, Petzval, Derogy.
This Petzval lens is 16cm high, the lenses are 61 mm in diameter, 210 mm focal length equivalent, for 13 x 18 cm coverage. Focusing is acheived thanks to a rack and pinion. The Derogy lens comes with a lens hood and cap. Serial number 17676, around 1870. Old traces of fungus on front lens, no haze, no separation, no scratches.