Hartblei 45mm Super Rotator in native Mamiya M Mount. I've had this lens for a few years, sold it to Ray here on GetDPI, bought it back from him again a couple of years later, and then used it for another year or so on my Sonys.
Excellent tilt/swing lens that can mount on any Mamiya/Phase One body or others with an appropriate adapter. Lately I've been using it on a Sony A7r with an E-> Mamiya M mount adapter that I'll include gratis if wanted.
I'll post pictures when I'm next home but this lens is in excellent condition, pretty much indestructible Russian build, and great to use. I'd keep it but it's just sitting here in a bag since I use the full set of Canon TSE lenses in my Sonys and Alpa FPS so it's not getting any love these days but not because of quality or utility.
Asking $1200 OBO.