#1251 Bayonet base flash lamp.
This flash lamp runs on full solenoid voltage.
It is the same size and style as the very common #89 which is a 13 volt bulb.
Many Williams & Bally games from the early to late 80’s use this flash lamp.
The locations were marked with a sticky red/white paper indicating #1251, but most of these have long since dried up and fallen off.
The schematic &/or the solenoid table will usually tell you where they are located within the game.
If you put a #89 in a #2151 socket it will pop after about 10 flashes.
Some titles that require #1251’s are: Pin*Bot, Cyclone, Grand Lizard, High Speed
Offered here in a 10-Pack.