Go to http://www.browning.com/customerservice/dategun/index.asp
No published sn data
Colt. Licences to manufacture it were also granted to Fabrique Nationale, Chartered Industries of Singapore, and Daewoo Heavy Industries.
Fabrique Nationale
Without knowing the rest of the markings, my best guess would be late WWII.
Fabrique Nationale (the name of the company) arms of war, Herstal, Belguim (place of manufacture. Brownings patent filed.
Fabrique Nationale d'Herstal
This is the Belgian firearms company Fabrique Nationale
fabrique nationale & Taurus
This is the Belgian firearms company Fabrique Nationale
This model was created in the world war era around 1927. The cost of purchase as at that time was $300.
Have you tried their web site?