I'll try to give some info from what I know about Chesini. Chesini frames are made in the beautiful city of Verona, Italy. You can see the Roman Arena (now used to give opera performances) in the logos on the bike.
From what I see the bike is from 78 - 80. The gearlevers and the front derailleur would indicate that. But they could have been replacements. But gearcables under the bottom bracket shell makes me lean towards later than 77.
What I like about it is primarily the style: very nice. But the brazing of lugs etc. is very sloppy. Maybe a lower priced model. The 'Chesini' engraved headset would indicate that too, as would the Sugino bottom bracket. Again that could have been a replacement.

'3 volte campione del mondo': 3 times world champion.
That's all the info I can give.
Have a look at some catalogues here: http://bulgier.net/pics/bike/Catalogs/chesini2/

Don't sell it, ride it!