I could have been on many Voigtlanders, the color skopar was almost a standard lens for voigtlander on their mid range cameras, with the Vaskar on the slightly lower price cameras and the Ultron on the top of the range, It was certainly used on a MF, probably a folder, You can't go by the shutter as they used the Compur,prontor and the low priced 4 speed Pronto shutter almost interchangeably, I have a couple of Vito 2's among my Voigtlander, both indentical specs apart from the shutters, one a prontor the other a compur, and many other mid range Voigtlanders were the same, it just depended what was available at the time, The lens would have been used on either a 645 or 66 camera, Voigtlander made a vast range of MF folders in their hey day,