What model fox is this?

#1
So I just went and picked this fox up but I'm not able to identify it. The tank on it was one I had laying around so don't necessarily use it to help identify but it does fit and should have a tank like it maybe not chrome though. Closest I've found to the frame was a sundowner model but everyone I seen had a saxonette engine not a 3.5 hp. And what's with the Hugh sprocket on the rear should it be that big? What do the gurus think? 20161206_192241.jpg View attachment 20161206_192559.jpg 20161206_192903.jpg
 
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