Hey guys,
Ok, here is a pistol by Claude Niquet for comparison.
http://www.hermann-historica.de/auktion/hhm52.pl?db=&f=ZAEHLER&c=6360&t=temartic_a_GB&co=3107 Most significant in my view is the but cap. Not identical, but quite similar in style and execution. Claude Niequet worked probably from around 1715 to around 1760 or so. I wouldn't conclude these pistols Ron has are necessarily by Niquet, but rather the similarities suggest a similar region and period of manufacture.
In general, here is what made me think they were made in Belgium:
Heavy reliance of stands of arms etc. in the decoration.
Heavily decorated guilt hardware. Well designed decoration, but not necessarily with the same degree of sophistication found in French work for example. This is a hard element to put to words, but if you look at enough Liege work, you will get the feel.
Tang with substantial sighting groove.
Lock design is generally conistent with other flat faced lock produced in Liege durging this time period.
Carving generally consistent with other work from this area.
It's important to note, that none of these details alone would necessarily indicate Liege manufacture, but as a group they make a pretty good case.