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I think it's an Astore.
"It is quiet rare" not the loud rare you usually find on ebay.
The Colombo book lumps them all together, no mention of an "Astorino". The one you've bought(?) looks to have a later ('52 onward) gas tank.
It is an Astorino, 250cc, I too have not been able to find it listed in the Guzzi books I have.I am in the process of buying a 1949 Astorino that was on Craigslist in California for a very short time a couple weeks ago. Patrick Hayes confirmed the make for me. I was shocked to see another one for sale, they were rare in Italy and not imported into North America. The one I am buying has a little more 'patina', a good candidate for a full restoration. The Astorino has the stamped rear swing arm and the rear shock absorbers, the Airione has the dog leg friction dampers.I can hardly wait for it to arrive!