The De Rosa track listed as a Moser ridden bike certainly is a nice bike. That said I have the EXACT same frame acquired last year. I have compared the frame I have with the pictures posted both on Ebay and Wool Jersey and conclude as best I am able that they are identical right down to the decals, livery, seat stays, fork, etc...
My frame was acquired from a racer, Trevor Rice who is now in New Zealand. I reached out to Trevor this morning and according to him he purchased the frame while living and racing in Italy direct from the factory. He states in an email today "I was racing with a New Zealand team in Italy for 6 months not with Samontana and as far as I am aware Moser never rode for them he rode for Sanson".
Incidentally on "some" De Rosa track models ridden by pros there was an engraving of the pros name and or initials on the top tube and fork crown. Not sure if this was at the factory or not but I have come across this on more than a couple De Rosa Pistas of the early 80's. Here is an example of one ridden by the Belgian Patrick Sercu:
Jason E. Osborne
Medford, NJ USA