RB67 6x6 Custom 120 back

This is an RB67 Pro-S 120 back that has been modified from 6x7 format to 6x6. This is the highest quality 6x6 back available for the Graflok 23 format! This back can generally expose 13 frames per roll of film, a 30% increase over the stock 6x7 back! It works with all cameras that accept Graflok 23 backs, including Mercury cameras, Horseman, Graflex (Century, Baby Speed Grafphic, and XL), and of course the Mamiya RB67 and RZ67. Its only limitation is that it does not auto-lock on frame advance. When advancing, you need to advance until the dot for the next frame is aligned in the frame counter window (see the last image here). This is very easy to do, but is slightly different from how the stock back works.