CHARGA-PLATE CREDIT TOKEN

Found this metal plate at an old house site. It was engraved and I thought it was a dog tag at first.  It has a name and address on it and on the back and around the edges it has "CHARGA-PLATE CREDIT TOKEN" and "Farr(something) Product".  The edges are also folded over and look like they should hold something.  It also looks like it has teeth that would require it to fit into a machine a certain way (See the top picture).

I researched "Charga-Plate" and found this article ((Wikipedia article - http://en.wikipedia.org/wiki/Credit_card).)

The Charga-Plate bookkeeping system, a precursor of the credit card issued by Charga-Plate Group, Inc. New York, was utilized from 1935 to 1950, and somewhat later.  "It was a 2 1/2" x 1 1/4" rectangle of sheet metal, similar to a military dog tag, that was embossed with the customer's name, city and state (no address). It held a small paper card for a signature. It was laid in the imprinter first, then a charge slip on top of it, onto which an inked ribbon was pressed. Charga-Plate was a trademark of Farrington Manufacturing Co. Charga-Plates were issued by large-scale merchants to their regular customers, much like department store credit cards of today. In some cases, the plates were kept in the issuing store rather than held by customers. When an authorized user made a purchase, a clerk retrieved the plate from the store's files and then processed the purchase. Charga-Plates speeded back-office bookkeeping that was done manually in paper ledgers in each store, before computers"

It does look like the article is a bit wrong.  The one I found has an address included.  I also found this picture showing the insert that goes on the back.  It has an address also.