Chesini X-bike 60s?

[bikenut2010]

could be but cables under top tube and I think even back then x-bikes used canti's. Out of my area of expertise though so perhaps you'r right....

Maybe it's mountain bike! who knows, i'm in the darkroom :?

 

[bikenut2010]

ITM stem and GB noodle bars? may fit Universal levers instead ...

 

[bikenut2010]

now up for sale viewtopic.php?f=47&t=249333