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 comes boxed (a very tatty box!), and has just two very minor marks on the screen, one very small, but otherwise really minimal 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.