Russ Denny-built Fusos are the real deal. I had one that was flawlessly made and was a great riding bike. With that paint scheme (monochromatic rather than the famous Fuso multi-color; mine was white) and the TIG-weldiing, my reasonably educated guess is that it comes from after when Denny took over the Fuso name from Dave Moulton which, if memory serves, was sometime in 1993.

GLWS. Somebody should be very happy with this beauty.