Great input Simon; a comprehensive description.
Ye, most probably Liege production. Although in Belgium they (also) used to apply a proof mark, by the time this pistol was made such proof marks system was not yet consolidated.
It is good to see that its barrel still turns off, something that so often doesn't occur.
Just a little note: although visibly this is not a Queen Anne pistol, the boxlock system was also widely used in such pistols, between 1750-1780. Actualy at a certain stage their production even exceeded that of side cock.
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