Actually, the Mazda brand was dropped in 1947 as far as I know, so the Mazda headlamp you are offering for sale is from 1947 at the latest, maybe much earlier, I don't know because you don't have a pic of the bulb. Does it have the exhaust tip or not? As far as if it works or not, you need to test it for continuity on an ohmmeter, or look at the filament for any breaks. Good luck!