What is this Lens Mount?

[Punkinhed7]

Saw this lens somewhere and can't quite figure out what camera it was intended for. Anyone know?

 

[Kino]

Looks like a Voigtländer lens of some sort...

 

[Punkinhed7]

Probably should have added that it's a Zeiss 80mm lens

 

[Kino]

Probably for some Medium Format camera; Isn't 80mm kinda rare in 35mm vintage systems?

 

[Punkinhed7]

Probably for some Medium Format camera

...but which? Only thing I could find was the reflex-korelle but while that camera did use a screw-mount, none of the lenses I could find had that distinctive cutaway/scalloping on the rear mount.

 

[Kino]

Could be just PART of a lens assembly...