Pop bumper switch used in classic Bally pinball machines.
The following machines are presumed to use this switch, but each machine has not been visually verified.
Atlantis
Beat the Clock
Beat the Clock
Black Belt
Black Pyramid
Blackwater 100
BMX
Bugs Bunny
Centaur
Centaur II
City Slicker
Dungeons & Dragons
Eight Ball Champ
Eight Ball Deluxe
Eight Ball Deluxe Limited Edition
Elvira and the Party Monsters
Embryon
Escape From the Lost World
Dr. Dude
Fathom
Fireball Classic
Fireball II
Gilligan's Island
Goldball
Grand Slam
Harley Davidson
Heavy Metal Meltdown
Karate Fight
Kings of Steel
Lady Luck
Medusa
Motordome
Mr. & Mrs. Pac-Man
Party Animal
Party Zone
Pool Sharks
Speakeasy
Speakeasy 4
Special Force
Special Force Girls
Spy Hunter
Strange Science
Transporter
Vector
X's & O's
Blackwater 100
BMX
Bugs Bunny
Centaur
Centaur II
City Slicker
Dungeons & Dragons
Eight Ball Champ
Eight Ball Deluxe
Eight Ball Deluxe Limited Edition
Elvira and the Party Monsters
Embryon
Escape From the Lost World
Dr. Dude
Fathom
Fireball Classic
Fireball II
Gilligan's Island
Goldball
Grand Slam
Harley Davidson
Heavy Metal Meltdown
Karate Fight
Kings of Steel
Lady Luck
Medusa
Motordome
Mr. & Mrs. Pac-Man
Party Animal
Party Zone
Pool Sharks
Speakeasy
Speakeasy 4
Special Force
Special Force Girls
Spy Hunter
Strange Science
Transporter
Vector
X's & O's