Awesome looking Olmo. It's very clean compared to most of the ones you see that age!
The Gran Sport I restored over a couple of years and sold last season just before gluing the tires onto the wheel set I had built up especially for the bike, may well be my most regrettable parting... I really wish I got to ride that Olmo at least once after all the time I put into the restoration! It had the same paint/chrome/graphics scheme as yours, and was almost all original with a Magistroni cottered crank set and first generation Record chain rings, Balilla brakes/calipers and a full Gran Sport drive train. The Ambrosio Champion stem and bars were both the alloy versions on mine. Alas, being a full-time student and recently married at the time was not conducive to expensive vintage bicycle restoration projects.
Enjoy it for the rest of us!
-Gregory