Did a little more research on line, and I think the initials VC followed by a serial number on great granddad's gun (see above) indicates his Belgium gun was made by Victor Collette. The following photo of a SxS hammer gun with a similar VC and number was found on:
http://www.littlegun.be/arme%20belge/artisans%20identifies%20c/a%20colette%20gb.htm
According to the web site the "mark V. COLETTE BREVETE, it acts of Victor COLETTE manufacturer of weapons quay Saint Léonard, 60 in LIEGE which was registered with the proofhouse of Liège of 1836 to 1909."
According to this list of proof marks, starting in 1893, the ring containing E over LG and a star had a crown on top of the ring. So, based on this information I think that great granddad's gun was likely made prior to 1909 and possibly prior to 1893.
http://shotguns.se/html/belgium.html