Yep. Gas filled National Lamp Co. Mazda. Not the same as the original series bulb but it's the only one I had that was close to the vintage of the luminaire. Also this is the only series street light I've come across that was internally adapted to 110v service. The contacts in the Jones receptacle were replaced with contacts that wouldn't close together when the socket was removed. That brings up the question - Did some of the manufacturers use the Jones receptacles for low voltage by using different receptacle contacts and inserting an insulator between the socket blades or were these just later adaptations?