Flipper End of Stroke (EOS) switch, straight.
This is a Normally Closed (N/C) “Low Current” EOS switch.
Found on the following brands:
Data East: (1993-94) Jurassic Park to Tommy
Sega: (1995-99) Batman Forever to Harley Davidson
Data East / Sega / Stern: 180-5149-00
The EOS switch is used to tell the computer when the flipper has pulled in all the way, which in turn then controls the current/power to the flipper coils.
A broken EOS switch will cause weak, overheating, or malfunctioning flippers. For use on electronic (computer-controlled) flippers only.