On the underside of the stem, is there a Cinelli mark? On the bar ends, is there a number? It is not unprecedented for Cinelli to act as an OEM.
Love the Ambrosio rims - rare to see. Very interesting to see that decal shape in 1955. I have a pair of Ambrosio rims from I think 1948 with an oval shape and no serrations on the sides of the rims.
I also saw Alessandro's Legnano, except I can't get his Photobucket link to work. I'd like to take a close look at it.