Anthony-
Read this:
http://bhovey.com/
Bob has assembled quite a bit of Masi Info, his registry is a bit lean in the late '82 through '83 bikes.
>From your serial number, C indicates thrid Quarter of '83. July, August, September.
So, prior to Joe Stark's arrival.
I do not know when Dave Tesch departed. I think Dave Moulton was gone also by this time.
The braze ons for a rack are very atypical, that with the earlier transfer set that has the Masi and the Gran Criterium in two different colors AND the blue background suggests a transfer set from much earlier, the Carlsbad period and before. Masi was using yellow for the primary text on the downtube for some time, with no background color. Not that it could not have been done, but not seen yet. I can see why a refinish was suspected.
Last blue background downtube panel frame I saw I think was Guy Apple's and it is from 1980 if I remember correctly.
So, not good for who did make it, but who did not.
John Jorgensen
Torrance Ca USA