This sale is for an excellent condition Mamiya 645 Super AE Prism Finder N, but with faulty metering so therefore only usable as a non-metered prism. It is suitable for use with the newer Mamiya 645 Super, Pro and ProTL cameras and will not fit the earlier M645 models.
This prism is actually a faulty Super AE prism damaged by a knock on the top. The metering displays the set shutter speed (so still more useful than a standard non-metered prism) but always shows “over” on the exposure metering so cannot be used for metering. The prism glass is fine, no problems at all, and the prism comes with its original eyecup. This would be great as a standard prism.
Instructions for this prism can be downloaded from this website. Note that this prism does not have a working light meter.