One of the older styles of flashing light (not a strobe). Used a locomotive headlight bulb pointing down at a rotating reflector. Common in the Pacific Northwest roads. Came with a clear, red, yellow, green or blue dome. Clear & amber being common on the railroads. Also used on emergency vehicles.
Includes 4 unpainted clear resin parts with a 1.2mm x 1.7mm deep recess for an LED.