This sale is for a good condition Mamiya RB67 ProS Waist Level Finder (WLF) – suitable for all of the Mamiya RB67 cameras – the Pro, ProS and ProSD – and also the RZ67 series.
This WLF is externally near mint but there is obvious paint loss at top of the rear flap when opened, but otherwise very few signs of use. However, the dioptre pops up all the time as the locking catch is not engaging with the dioptre panel so you need to hold (or wedge/tape) down dioptre panel if you want it out of the way. Bit of a pain in the bum but it works and is half the price of a really nice one. No doubt it could be repaired / bodged if you wanted to do it.