The PV under the Lion (thats what it is supposed to be) is the belgian nitro proof mark, the * over AH is an inspectors or controllers mark, the other mark is a Perron which is the mark of the Liege proof house. All indications are that the gun was made in the late 1940s. This site http://site.voila.fr/guideliege/ has a lot of info but is in french, if you open it with Google you can translate it

I learn something every day, and a lot of times it's that what I learned the day before was wrong