The Billboard Blinker No. 410 was intended to be used with the No. 310 Billboard Set. By the use of a thermal switch the light would blink off and on. There is an adjusting screw to control the rate of blinking on the back side. Originally, it came with a No. 50 6-8 volt bayonet lamp. We’d recommend using a No. 445 18 volt lamp and 12 volt accessory current for this blinker. This accessory was constructed entirely out of BLACK sheet and cast metal.

There are no known variations for this accessory, however, an identical blinker was produced by MPC in the Modern Era under the No. 2307 from 1982 until 1986. The inscription on the Post War version is: "No. 410 BILLBOARD BLINKER / MADE IN U.S. OF AMERICA / THE LIONEL CORPORATION"

Dimensions: 4-5/8 inches long, 7/8 inches wide, and 4-11/16 inches high.