Welcome to the forum.
According to this website, a Maurice Arendt was registered with Liege, Belgium proofhouse 1857-1889, but I believe your gun is later than that: http://www.littlegun.be/arme%20belge...rendt%20gb.htm
Look on the rear face of cylinder for an ELG in oval Liege proofmark: If there's a crown on top of the oval, it was made after 1892 and as late as 1914.
Brevete just means patent.
7.65mm indicates it's chambered for the .32 Auto round, which is semi-rimmed and used in many such Belgian revolvers.