vintage Justrite portable electric miner's/industrial lantern.  I myself have never seen anything like this one.  I purchased from an estate sale in Louisville, CO -  A town known for Coal Miners back in the day.  She said that her Great Great Grandfather worked the mines and believes that this lantern he used for this purpose.  I found her story very interesting.  This is not tested and not cleaned as I will leave that to the buyer on the best way they see fit to do.  It measures with the handle 8".  Please ask questions if you might have.