More from the grapevine ... or should i say, courtesy Rainer Daehnhardt 
.
" For those who are willing to learn and never handled very long pistol barrels of royal provenance remounted at a later period:
Here is a Louis XIII wheellock pistol barrel of the XVIIth century used at Napoleon’s time to create a small flintlock fowler for a young boy.
The other barrel still exists in a museum, all complete with it’s french wheelock ignition system and it’s original butt. Who put it together was an apprentice of the LePage shop in a difficult political period, when LePage was closed.
The small boy’s fowler with a spanish boot-butt was created by using a number of elements of a royal bavarian wheellock pistol of the turn of the XVIth to the XVIIth century to be used at the Munique Court of the Elector of Bavaria.
The barrel is heavily chiseled with gold leave ground
rather similar to the 1584 pistols. The reason is simple. Most gunmakers working in Lisbon by then were of German origin so their guns were born out with the same taste. What is very unusual on this marriage of elements of two different periods is that they did not only use the early barrel but also the ramrod pipes, the butt finial, the barrel tang and even a major part of the lockplate ".