I have this model in a very good condition, it is model 4 (Kuc). Everything works as it should. It even has a flash synch, beautifully hidden behind the right strap lug connector.
All my other Contax I cameras only work partially, the fast speeds are the big problem on these cameras.
I think that the above camera is overhauled, at least it has the small nickel nobbysparrow screws.