Rolleiflex green filter bayonet 3 by Hoya
Hoya infra red filter for Rolleiflex can be used on lenses with a bayonet 3 mount. In very good and usable condition. Including plastic case, box and instructions.
How can I figure out the bayonet size of my camera?
By looking at the camera number, you can determine the bayonet size of your camera. See the attached scheme.