Looks like it could be a nice, sporty Zullo.

Maybe a Sprint or a Special.

Please look on the top of the bottom bracket shell and tell me if it says Sprint or Special.

Here are a couple of pics of my early 1980s Sprint when I first brought her home. Hope these help.

Btw Three of the four Zullos I've owned came with Shimano 600 originally.

My Sprint was originally built witha mix of Gran Sport and Nuovo Record.