Mamiya 645 Super Pro / TL WLF Waist Level Finder N
This is the waist level for the Super, Pro and TL models. These are getting impossible to find.
Note that you pop up the magnifier with a tab on the winder side near the top.
The finder is in excellent condition and works perfectly. It shows light wear. The magnifier's glass is clean and scratch free with no haze, fungus, or other issues.