Simplex 4904-9137 This is, in fact, a Simplex 4904-9137. It’s just missing its housing. Brand SimplexModel 4904-9137Manufacturer SimplexType Alarm (Strobe)
Wheelock EH-EL1 Category : WheelockThis horn was attached to my Space Age Electronics A32-BL-SFXC-TJ24B-0000 when I received it.
Wheelock 7002T-24 Category : WheelockEach 7002T-24 has a somewhat different pitch, so I’ve kept several that sound different from each other.