Apparently these were fairly rare and somewhat created to test the waters. There is a completed auction on eBay that I had tried to bid on but couldn't meet the reserve. It is item 7236762551, if you want to do a search. Here is what it says out there:

"I bought this bike in 1975 from the Kissena Cycling Club in NY. A number of them were given to the club to ride and evaluate. This was Mossberg's only foray into the road bike explosion of the early 70's. It is one of the first Carbon Fiber bikes ever made, and the only ones made by Mossberg. I can only tell you a few thing about it since I am not a rider.

1. 24" (60cm) from Center of Crank to Top of Seat Tube
2. Shimano DuarAce Brakes
3. Shimano Crane Derailleur 10 Speed
4. Simano DuraAce Crank Set
5. Campangolo Hubs
6. Shimano DuraAce Brakes
7. Sakae Handlebar Bracket
8. Sew Up Tires??? Glued On
9. Weight of bike as shown: 22lbs"

Maybe that helps.