Williams/Bally single contact flipper button cabinet switch.
Used on many (but not all) Williams pinball machines from 1978 to 1991, and many (but not all) Bally pinball machines from 1988 to 1991.
Used on many (but not all) Williams pinball machines from 1978 to 1991, and many (but not all) Bally pinball machines from 1988 to 1991.
Williams #SW-10A-48.