Only a small India stamp near the hilt. No others, course that's enough to ensure No US generals carried it at Appomatax.
I think the $60 price tag was enough to ensure that.
I've had some good luck, at that auction site which will not be named here, finding sword-like French bayonets from the mid 1800s, when they still made them with stylish curves. They must have made thousands of them back in the day, since many are still around with mostly surface rust that can be removed without too much work. I'm pretty sure they are authentic/originals, based on close inspection and the details of their construction. They usually run around $150-$300 depending on the condition. The company/arsenal name and year of manufacture are engraved on the spine, and the blade and scabbard are numbered (often with matching numbers). I suppose it's possible that some of them were manufactured more recently than the engraved date, but they are not just replicas.
There seem to be two main types, as pictured below. One type has a fairly elegant curved blade (29" OAL) with a wide "blood groove" that looks more like a sword than a bayonet (but the handle fixture is definitely bayonet). The other type has a somewhat shorter straight blade (25.5" OAL) with a T-cross section spine for rigidity; the edge is not sharpened and the blade is clearly designed for thrusting, but you could also give someone a good rap on the head if you swung it sideways with a flick of the wrist. The balance and control are excellent.
These pictures were taken before I cleaned up the blades, so you can see that they came in pretty good shape. The metal scabbards, on the other hand, had a lot of surface roughness and didn't clean up as well as the blades.
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Here's a link to a Wikipedia article about the St. Etienne Arsenal:
https://en.wikipedia.org/wiki/Manufacture_d'armes_de_Saint-Étienne
An excerpt:
"[A] French state-owned manufacturing company located in the town of Saint-Étienne....
"Saint-Étienne was already a well-known place for production of swords and knives since the Middle Ages. In 1665, a Royal Arms Depot was created in Paris to store military weapons made in Saint-Étienne....
"The Royal Arms Manufacture was created in 1764 under the supervision of the General Inspector of the Royal Arms Manufacture of Charleville....
"12,000 weapons were being produced each year when French Revolution happened. The city was renamed Armsville during the revolutionary period and production increased to meet demand of the revolutionary army fighting at the borders against the Royalists supported by European royal families.
The French Empire saw the production increase threefold to meet the needs of the Napoleonic Army in its conquest of Europe...."