+1 that the seat clamp/bolt would likely point to Legnano. Serial #'s on the seat tube may also be an indicator. The color/pantina is pretty cool. From what I've seen, a rear brake release for center pulls is usually attached to a seat bolt. Since the position of seat/clamp is located in an odd spot, it look's like another variation - interesting.

I don't get the slot/hole on the top of the fork. Maybe someone can shed some light. Great bike...