Originally Posted by Amberg

Allegro database ... does one exist?

YES

Over the last then years I collected frame numbers and pictures of old Swiss bicycles as I always wanted to know their age. Beside in the internet I found lots of old bicycles at Swiss railway stations and in Swiss collections and museums. Meanwhile I have a huge database with old Allegro, Mondia, Condor, Cilo, Tigra and many other brands. Valuable information I also got from old Swiss bicycle newspaper which date back as far as 1889.

According to my data base the serial number 99116 is from 1946 (90%) or very late 1945.

Best regards from Switzerland
Michael