Dave Moulton is on the Keeper of the Flame CR webpage.
I recently corresponded with Dave and in brief this is the basic story: He worked at Masi end of 1980 until 1982. In the summer of 1982, while still at the Masi facility, he started building frames using Dave Moulton on the frames. In July, 1983, he opened his own frame shop in San Marcos (CA). All the Dave Moulton (labeled as such) framers were custom builds. In 1984 he started to build using the Fuso brand; this was "an attempt to bring down the cost without sacrificing quality, was built five of one size at a time.....The Fuso frames were numbered in sequence starting at Number 1..... When I left the business in 1993 Fuso numbers were up in the 3000s."
You might be able to guestimate when your bike was built. If you look in the archives you will find more complete information I emailed the CR list based on Dave's comments.
Angel Garcia Long Valley, NJ
Subject: [CR]Fuso/Dave Moulton on/off topic ?
> Today I received a Fuso I bought on ebay and before I ask any questions I
would like to know if it is on topic although out of the time line? It is
steel lugged, although the equipment isn't on topic, and I believe Dave
built for Masi in CA, but not sure about that, and it would seem it is a
keeper of the flame kind of frame if anything.
>
> What a schweet ride it is,
>
> Mark Poore
> Overcast in Slatyfork, WV