Here is a Vintage 1930's NORS 6V Voltage Regulator.  This is new old stock / vintage reproduction in very good condition.  I do not see a makers mark only "Heavy Duty" and "Made In USA".  I believe this will fit a number of different applications in the 1930's and 1940's but please verify your specific application, check out the pictures, and ask questions before bidding.  Professional packaging guaranteed (see our feedback).  Bid with confidence and good luck.

Check out our auctions and other items on eBay in "The Old Car Parts Store" for many similar items.