Well, it is 7.65 mm, known in the US as a .32 ACP or .32 Auto. It is a Browning style pistol, made by FN, a very good company. Condition is everything- your pistol may be worth $100, or $500. Have a good gun shop take a look, and see what advice they can offer.
What is the question? Fabrique Nationale is the Belgian manufacturer of Browning Arms. Herstal Belgium is the city where they are located.
Without a better description; 10-1000 USD