Bianchi Special by Columbus tubing decal should place it 1985 and make it an Italian manufactured model. The serial number should confirm this. It appears to be a frankenbike based on the components. The derailleurs suggest a Trofeo, while the crankset and brakes suggest a Nuovo Alloro. Regardless, both used the same frame and the variance could also be due to it being a foreign market model.

Edit: The derailleurs appear to be Campagnolo Triomphe.