Voigtlander Turnit 3 35/50/100mm Viewfinder format_1 Inch It includes three Universal Flashlight

It includes three Universal Flashlight Adapters

It was designed to produce images for View-Master Stereo Reels- sold separately- and has an unusual colour wheel guide for choosing shutter speed

serviceable hardware

I feel I should add

it may as well be a weird one

Voigtlander Turnit 3 35/50/100mm Viewfinder format_1 Inch It includes three Universal FlashlightThe Turnit 3 (model 339 50)is a clever viewfinder that switches between 35mm, 50mm, and 100mm focal lengths with a quick rotation (and or a little door flip.) The 50mm field of view is accomplished with a mask over the 35mm, but the 100mm is thankfully not: the whole optical system spins around to change magnification, and that's why they call it a Turnit. In excellent condition, with light finish wear.