I was interested in the use and actual availability of wire in the trans-Appalachian region in the 1st quarter of the 19th century. Dederot shows it, certainly but just because t was available in France does not mean it was actually available in the region (I've been a museum director, event sponsor, as well as a re-enactor and I could write a book on dubious and misapplied "documentation")
i know that wire was used to wrap grips on swords and dirks at a fairly early date, maybe our historical accouterment made might have a better handle, or grasp, of the question.
I suspect that drawn iron, brass (and of course silver and gold--for jewelry and very high grade arms) might have been available to some extent. I think that copper wire is a much later thing.
the inletted brass plates are interesting. I have also seen a few on old trade guns and rifles with thin brass wear plates on the for ends ahead of the trigger guard behind the thimble where the wood had been abraded from cross-saddle wear.