The accessory lenses were made by Steinheil, and mine is marked made in the US occupied Zone of Germany. It is a 100mm F4.5 lens, made to look like a Zeiss lens for the Contax. The lens includes a mask for the Tiny C3 finder, as it does not have an accessory shoe. The C44 will take an accessory finder. The later C3 manuals deny the existance of these lenses and state that the lens of the camera is removable so that you can use it on your enlarger. Funny thing is that the wide-angle and Telephoto lenses were made for and sold by Argus.
If you want a good German Rangefinder that takes a range of lenses, look to a Retina IIIS. $200 should pick up a Camera, 35mm F2.8, 50mm F1.9, and 135mm F4 lens. It is a top notch camera with a great finder with projected/parallax corrected framelines.