High quality Schneider Componon 105mm f/5.6 enlarging lens. It's not 39mm thread - it's stuck on a plate with a 50mm diameter)
Lens in good shape with original box . The lens is stuck on the mount. i'm not sure if it's glued or just fused on but it's just super tight and I don't want to remove in case i do damage. a 39mm screw adaptor (male mount) such as the type made by BPM could be glued flush to the plate so it could then attach to any 39mm screw thread female mount.