This is a Grundlich Turner-Reich Astigmat Triple convertible lens with Betax No. 4 Shutter. It is a high quality lens with a maximum aperture of f/7, a convertible/prime at 12”, 19.7”, and 25”. The lens is made of brass and was manufactured in Germany. It is perfect for capturing clear, high-quality images with a full-frame camera.

Nice example. Glass is very good for its age.

Shutter works great. Speeds are pretty close.

Comes with jam ring with screw holes.

Overall an awesome shooter for 8x10!