System Sensor MA/SS-24D Category : System Sensor Just another duplicate. Brand System SensorModel MA/SS-24DManufacturer System SensorType Alarm (Sounder/Strobe)
Space Age AV32+2DCD Category : Space Age ElectronicsThat is an electromechanical horn on the rear of the strobe plate.
Gamewell GW-30203-01 Category : GamewellThis is a somewhat obscure Gamewell alarm condition light, most likely used with system components such as duct detectors.