It was made in Liege as one of many thousands of revolvers of that general design made from about 1880 to about 1914. Some collectors call them all "velodog" revolvers, but the cylinder length indicates that one really is chambered for the velodog cartridge.
Here are a couple of sites with more info on those guns and the Liege gun making in general.
http://damascus-barrels.com/Belgian_Trade_Marks.html
http://www.littlegun.be/arme%20belge...belge%20gb.htm
Jim