Vince Lupo
Whatever
I've had this for such a long time I forgot where I got it from. It's an adapter ring that allows you to use Leica LTM lenses on a Contax (Contax II, III, etc). Don't know how the lenses would focus as the film to lens distance is different between the Contax and the Leica, but has anyone ever heard of one? I've seen adapters that allow you to use Contax lenses on a Leica, but not the other way around.
I believe these were to use a Leica mount lens on an enlarger that used Contax mount lenses. in he 1930's, Enlargers were made to use the normal lenses of the camera. I believe (read somewhere) that Zeiss enlargers could use Contax Mount lenses.