VERY RARE BRASS LENS Rapid Rectilinear Type. THERE ARE NO GRAVING LABEL BUT IT IS HIGH STYLE SAYS IT WAS MADE BY A PRIME BRAND LIKE ROSS, DALLMEYER, DARLOT. CONDITION IS EXCELLENT WORKING. Glass is absolutely excellent. Damages, no scratches, no. No haze, no fog, no separation, no chips. Measured focal distance is about 22-22 cm. Maximum Aperture Value is F8. Aperture blades work great. Lens barrel is in good condition with signs from time. The lens is fully usable and can be used on a camera. For a wet plate collodium. Or another photo expierements. Lens comes with a mounting flange. Buyers with a feedback of less than 10 points should contact me first!