This sale is for a really excellent condition Mamiya RB67 ProS No. 2 Checker (Grid) focus screen, suitable for use with all RB67 cameras.
This screen has a couple of faint marks at one edge (much less visible looking through the screen than when just looking at it) but otherwise it is just about perfect. There is slight brassing on the pressure springs but no other signs of use. The grid pattern is ideal as a compositional aid, ensuring that everything is exactly horizontal or vertical, as required. A really useful screen. Try finding another one – these are almost impossible to find.