Which view finder is this? Mamiya m645 super

MattKing said:

That looks like an AE Finder FK402 that was sold as part of a kit with the Mamiya 645 Pro and/or Pro Tl.
Strictly speaking it isn't a pentaprism finder - it is a pentamirror finder. Which means that it is lighter than a pentaprism finder, but less bright.
Here is a link on Mike Butkus' site to a manual: https://www.butkus.org/chinon/mamiya/mamiya_645_ae_finder/mamiya_645_ae_finder.htm
If you make use of the link, please consider sending Mr. Butkus his requested donation.
You should note though the following excerpt from that manual:
1. The Finder FK402 is exclusively designed for the 645 PRO Camera and it cannot be fitted with M645SUPER Camera." (emphasis added)

Click to expand...