Help identifying my carburetor

I have been trying to identify my carburetor for an hour or so with no luck. It has w with a line under it cast on the front side with the numbers 1405 and 1725 stamped on there. On the drivers side the numbers 8867 are on there. On the top there is another W with a big bar under it. I am trying to identify the carburetor so I can buy a book on it and possibly buy another one to train on. I am starting to think this is a knock off. I can match it to anything on identification charts and google has got me nowhere..Thanks in advance for any help you can give me.

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