VINTAGE FEDERAL SIGN AND SIGNAL 12V FIRE ENGINE TRUCK SIREN MODEL Q2A CHROME OEM. Has an additional base. That is why back is off. Works. Selling a large collection. Smoke free home. On Jul-30-23 at 15:17:34 PDT, seller added the following information: Does have a base that goes with it. I found it right before listing ended. So cannot revise pics. But really nice chrome base.