Purple video game and flipper cabinet pushbutton assembly used by many machines manufactured in the 70's & 80's.
The shaft length is 1-3/8" measured from end of actuator to underside of mounting flange.
Reference:
3A-7531-3

Blue video game and flipper cabinet pushbutton assembly

Pushbutton 1-3/8 inch clear

Green video game and flipper cabinet pushbutton assembly

White video game and flipper cabinet pushbutton assembly

Pushbutton - 1-3/8 inch yellow

Red video game and flipper cabinet pushbutton assembly.