Good point and the French (extremely controversially) had alliances and positive relations with the ottomans in the 1500s.Our Sam has certainly got some clues .Which I mean in a complimentary way. As for loot after Waterloo I think all the Cabinet d arms guns had inventory numbers so the V&A gun likely had these As for mixes of parts & cultures even the Vikings traded into the Ottoman Empire .' Business is business'after all.
Regards Rudyard