Don't know how rare it is but that is a really nice decoy. Wish it was mine! The pattern of the blue on the bill is kind of odd but that may be an identifier.

Please don't repaint it or clean it up. In doing so you will radically reduce the value. It has a few dings and stuff on it but that is due to it being used by a waterfowler in the Golden Age of Waterfowling. It is a fine example of that era and was held and used with pride by an old duck hunter. I have a lot of old decoys and each one has a story. I even have some that I learned to duck hunt over on Rush Lake in Wisconsin.

Moosetrot