Transparent green video game and flipper cabinet pushbutton assembly used by many machines manufactured in the 70's & 80's.
Shaft length is 1-3/8 inches measured from end of actuator to underside of mounting flange.
Reference:
3A-7531-2

Blue video game and flipper cabinet pushbutton assembly

Pushbutton 1-3/8 inch clear

Green video game and flipper cabinet pushbutton assembly

Purple video game and flipper cabinet pushbutton assembly

White video game and flipper cabinet pushbutton assembly

Green opaque pushbutton with internal spring