This gun appears to be a genuine extra finish best work gun. Such guns can be of most any brand. The master gun makers knew which of their in-workers and which out-workers were capable of such work, what their time frame was and what they charged. Original Quality grade of a gun is independent of brand. However, obtaining commissions to make such guns was another matter altogether.
Four Liege makes of the later 1800's - early 1900's set about to elevate the status of their area's trade by adopting the informal standards of the London trade. They were Lebeau, Francotte, Bury, and - and - rats, my memory has slipped a cog. OK, who was the fourth? Their names do not guarantee a best work gun, but a gun that appears best work with one of these four names is likely to be such. Keep in mind that almost all makes supplied a range of quality grades - the Belgians were not exceptions.
Hope that helps.
DDA
