Hi Cornelis,
I have to consent to Gav's lines: this is a real high quality piece indeed.
BTW, I would not call it composite; it was common use in all the old nobility arsenals (
Gewehrkammern) to restock fine Oriental barrels and sometimes locks in the German manner.
I define 'composite' as composed of older parts at some later time than the working life in order to purport the impression of a homogenous piece. The stock of this piece can be dated to ca. 1740, though, which is no doubt within the 'second working life' of the iron parts.
It is highly unusual in having bone finials engraved in late 16th century style to both the forestock and the ramrod. The ramrod should consequently be equipped with a threaded iron finial on its rear end.
The style of the raised elongated and fluted muzzle section (
Mündungskopf) was copied in the Oriental regions from early 16th North Italian and South German barrels. I posted photos of such in quite a few of my threads.
First class provenance as of your gun further adds to both the material and the immaterial value.
Well done, pal! Keep trackin'!
Best,
Michael