Wonderful Mamiya ZE. Very nice condition, Mamiya ZE was introduced in July 1980. It has a metal, quartz-controlled, focal-plane shutter and a center-weighted photo diode. An aperture-priority AE, exposure can be corrected ± two stops, and a previously-metered exposure can be locked in "AEL" position (same dial as the orange "Auto" button in the picture).
It requires four (4) MS76 or equivalent batteries, which are still readily available. The ZE can also be used without batteries. If you set the shutter mode selector to "X" the shutter operates at 1/90 sec. Simply use the Sunny 16 Rule to figure the aperture setting for your weather conditions.