Vintage Miner's Justrite Battery Powered Head Lamp - Made in USA

Vintage Miner's Justrite Battery Powered Head Lamp - Made in USA. Although I cannot find an exact match to this lamp, it would seem as though it was used in the 1960's. The battery pack is yellow, and has 2 loops throught which the belt was threaded. It has a button witch releases the bottom, so that batteries could be replenished. A power cord comes through the top to the head lamp. The head lamp has a bracket that  tilts forward and backward. Attached to the bracket is a band which would have gone around the miners helmet. The light also has an on/off switch. The lamp is intact (including bulb), and in good condition for its age. I have not tested if it works, as i do not know what batteries it uses. There is however no reason that it should not work from what I see.