Mystery Object (Can anyone possibly tell me what this was used for?)

[LittleMac]

Hello everyone,
I work for the Goodwill in Missoula posting interesting items to our auction site. Usually it isn't so difficult identifying these items, but I need help with this one. "Cole - Hersee - Boston" is engraved on the metal flaps over the end of what appears to be a light socket? It has a wooden handle and the other end of the cord is a threaded plug I've never seen before. I'd appreciate any help I can get as the company didn't respond to our email requests for info. If clearer photos are needed I'd be more than happy to provide them. Thanks all!

 

[Externet]

It is an automotive or marine worklight.
Plugs into a bulb socket that may be under the hood or on a light fixture.
Its own light bulb is missing, and has protective covers for its glass when stored in a tool box.
The hook allows to hang it overhead or somewhere.