I checked the patent for data printing on the film during rewind a while back
& I think these contacts inside the camera are for that purpose.

The C.R. Kennedy site also explains the MZ-S battery grip controls.

********
BG-10 Battery Grip :
     Powered by four AA-sized alkaline or lithium batteries and featuring a
     matching design with the MZ-S camera body, this grip dramatically
increases
     the number of film rolls that can be taken without having to change
batteries. It
     also comes equipped with an extra shutter release button for
vertical-position
     shooting, an AE lock button, a preview lever, a remote shutter release
     function, and vertical-position strap lugs. Thanks to its original mount

     mechanism, this grip can be attached to and removed from the MZ-S in a
     matter of seconds.
********

David S.

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