Type R51, Retrofocus. Made in 1957. 8 elements in 8 groups. Preset aperture type. Meter scale. The closest focal length is 40cm. Fits 62mm screw-in type filter. Coming with a genuine front caps. Fully serviced in April 2019. Slight deterioration in the coating and dust inside, yet still pretty clean glass for Angenieux without noticeable marks. The barrel has signs of use, yet all the parts are in good working condition. Makes nice image!