The first thing to understand here is that a bicycle is known by the badging of the frame...you own a Western Flyer, not a Huffman, not a Dayton.
Huffman was indeed the manufacturer and Dayton was their "house" brand which was also their top of the line bicycles in a given year, having the most deluxe paint schemes and components.
That frame was made both prewar and post war and since is does not sport many of its original components, the serial number, fork, chainguard, and the badge itself are the clues.
To my knowledge, Huffman serial numbers have not been formally gathered, although if you spend some time poking around, you might find a SN posted here with a positive ID on year which you could extrapolate from.
Another reference would be looking through Western Auto catalogs as I do not know when Huffman was a jobber exactly year to year.
My guess is prewar 40-42 in assessing the badge if that chainguard came with the bike.
Chris