Simplex 4903-9101 Category : Simplex Clearly, this alarm is not in its prime. Brand SimplexModel 4903-9101Manufacturer UnknownType Alarm (Strobe Plate)
Simplex 4904-9137 Category : SimplexThis is, in fact, a Simplex 4904-9137. It’s just missing its housing.
FCI MS-2 Category : FCIThis is an earlier generation MS-2. The metal piece on the inside which holds the handle open once it has...
Space Age AV32+2DCD Category : Space Age ElectronicsThat is an electromechanical horn on the rear of the strobe plate.
