I have five of these lights but I don't see any markings on them. I don't know whether they're from a car or from some kind of farm implement. Does anyone recognize them? The black can is 6 in deep and the lens is 6 in diameter. On the top of the lens it is frosted and there is a secondary bulb, that looks like it could be used for a blinker and the bulb is clear. The yellow stamp in the last picture is on the inside of the can. Does anyone recognize these?