On Paolo's site is this,
Bici Classiche : Legnano 1949A 1949 with serial number CG1706. That would put yours at 1949/1950. That bike and your bike share the push-up type of front brake.I don't think your handlebars are original. They would be unusual for Legnano bars if you look at the catalogs from the era. You are also missing the the chainguard but those come up often on Italian ebay.
The handlebars are Giorgia, they are not supposed to be Giorgia? Some other parts of the bike are Giorgia as well, like the breaks. Yeah i notice the chainguard and the front badge are missing as well. To bad!