Thanks for the replies.
I can't see a more likely origin than Birmingham, -given the recorded presence of a maker called Cutler in the Gun Quarter in the era to which the gun belongs, not to mention a viewpoint undoubtedly weighted by having bought the gun not half an hour's drive from there- hence my puzzlement at the London attribution on the rib.
I can't see anyone counterfeiting a Cutler gun (hardly a name to conjure with, and no minor nuisance to Google for when so many early gunmakers' were also sword cutlers). Moreover there are no stylistic features of the gun itself I would take to be Continental and thus suggestive of a Belgian origin overall.
This brings us to the idea that Birmingham gunmakers in the 1830s (?) bought barrels from Belgium, rather than shopping (much) closer to home. I must confess this seems implausible to me, but as surprise is often a signpost on the road from ignorance to knowledge, I'll keep an open mind, especially if the absence of British proof marks, and perhaps also "STUBS" rather than "STUB" twist, may indicate barrels made abroad. [Edit: see my later post on the likelihood of Belgian barrels in this case.]
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