Winchester model 12 featherweight

Question
Could you please date this model 12, 1806362F and tell me why it is so hard to find information about the featherweight

Answer
It was made between 1959-1962. I can't narrow it any further. In the grand scale it was a very small number of guns produced. Basically it was a slight variation in model 12 to save a little weight. Alloy instead of steel were used where it could be used. The entire model 12 was replaced in 1963 with model 1200.