Phase One P21+ back in Mamiya/Phase mount. Has about 5300 actuations, mechanically and optically mint. This back has the value added warranty until May 2010, platform swap has already been used (you can still change mounts, you'll just have to pay for it). It's a great back, I just needed to upgrade and it was cheaper to buy used and sell this than upgrade through Phase. The back comes with charger, one battery, and the phase one pelican case that ships with classic warranty backs.
Price is $9500. Located in NYC, you can pick it up in person if you'd like or I can ship, payment by cash or cashier's check. I don't usually post here but I can give you references from several members of this forum.
Will consider partial trades of any of the following items. Please don't email about anything else, if it's not listed below I don't need it. Also, please don't expect me to give you $5000 for your H1 kit, unless you also want to pay full retail for my back:
Hasselblad H1 Body
Hasselblad H1 Kit
Hasselblad HC 300mm Lens
Contax 645 45-90mm Zoom
Canon 1Ds Mark III
Phase One 645 Camera Kit
Mamiya AFD 300mm Lens
Mamiya AFD 120mm D Lens
Mamiya AFD 28mm Lens