They made a hundred of the Zagato VM180s, as part of a limited edition run that included the TRD VM180 and the Modellista Caserta:
Zagato are indeed an Italian company - Modellista are Japanese IIRC.
ETA: The first car you linked to is incorrectly identified as a Zagato - it's a Caserta.
Yes, it's a TOM'S body. Looks like it's got the poverty spec steel wheels fitted though!!
ETA, this bit -トムスW123 - translates as "TOM W123", which gives us the correct model number: http://www.tomsracing.co.jp/e/comp/w123/index.html
I think you can even unlock this car in Forza Motorsport 3!