Made by Instrument Laboratory, their catalog #24259. This is an instrument lamp (not a clue what instrument) with what we are told is a UV filter and lens. The bulb is #62, 3.45VDC. Includes 2 wire lead 9" leads. The assembly is 3" X 1-3/4" X 1-3/4" high and has an opening on the top for ventilation and soft "bumpers" on the right where the device probably slid into its instrument. Lots of uses especially for experiments. Unused in the original packaging.