Yes, the Savoia marchetti 80 is a beauty. Actually, according to Italian Wikipedia, it is an S 80 bis - the original was single engined I think:
http://it.wikipedia.org/wiki/Savoia-Marchetti_S.80
http://it.wikipedia.org/wiki/Savoia-Marchetti_S.80_bis
I like the undercarriage retraction mechanism - very simple, but elegant.