checking the pics in www.bulgier.net, the Treviso without chrome chainstay could be before 1985. The Treviso decal seems out of place and in surprising condition for the age of the bike. Was the bike repainted?

Component pics aren't much help as they are very often not original and many older frames were built up at the bike shop with whatever they had or the customer wanted.

Good shots of decals, lugwork, dropouts, fork crowns, bottom brackets, serial numbers, chain hangers, cable guides, headbadges, brake bridges, any unusual bits, etc. are preferred. Close but not too close for a good pic. And no cell phone camera photos.