Linhof Techno-Rollex 6x12 back (only one)

The greatest rollfilm back every created! The engineering is out of this world, and the back loads and works perfectly. This back has a full 120mm frame width, 8mm larger than standard 6x12 backs. It holds film flatter than any other back, operates smoother, has perfect film spacing, and is the only 6x12 back ever invented that can take both 120 and 220 film.

There are plenty signs of use here: weathered leatherette, scrapes, etc.  Nothing that affects functionality. This thing works 100%. It's the best film back I own.

This is the newer version of the back, with streamlined corners. The photos I've shot on this all turned out perfectly.

This is the best possible back for the Mercury Stereo 12, and also works on any 4x5 large format camera with a Graflok/International back.