Cambo SLW-88 WRS / ACTUS DB adapter plate for Phase One, Mamiya and Leaf backs up to IQ2 backs. Can also be used with IQ3/IQ4 backs but some of the pins will be pushed in while mounted to the adapter. The back will work regardless.
It is in mint condition except for the usual rub marks where the back mounts and where the plate mounts to the camera.
Not much more to say, it is a piece of metal that does what it is supposed to do.
New price is $550. I'm selling it for USD 275 / Euro 250 + shipping.