That's Basically 3/4 Of The Lupin Iii Gang Right - Blog Posts

Consider:

Victorian England: 1867-1901

American Old West: 1803-1912

Meiji Restoration: 1868-1912

French privateering in the Gulf of Mexico: ended circa 1830

Conclusion: an adventuring party consisting of a Victorian gentleman thief, an Old West gunslinger, a disgraced former samurai, and an elderly French pirate is actually 100% historically plausible.