I traded this for a much shorter pattern Bayonet with a friend of mine who said he had gotten it at an antique store in my town. It looks most similar to a french pattern Sword Bayonet that I saw for sale on Liongate Arms and Armor a while back. However, the key difference between that one and mine is an intact celluloid grip and a different locking mechanism. The grip on my Sword Bayonet was lost when I acquired it so I have no way of knowing what it was. I can tell however, that it was a composite formed by the pommel and some other material. I'm guessing wood, I keep the grip bound strictly so that I can practice forms with it. I have read that Sword Bayonets are rare as they were phased out relatively quick, so I store mine well and do not hack down brush with it . . . Or use it to crow-bar . . . Anyway, the illustration and photographs that I'm providing should give all the other information that those of you indentifying it's pedigree will need: If my experience seeing how quickly weapons on this forum are identified is any indication.
Please and Thank you.

Sincerely, Korey Lavoie.

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"H" stamp on the pommel.

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"S" and "C" marks on hilt.

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MS Paint diagram of the Hilt components and attachment mechanism.

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That I know of there were bayonettes of this recurve shape made by firms in both England and France. A small quantity of Enfield muskets with bayonettes of this type were imported during the Civil War in the states. The French type was for I believe the Chassepot (sp) rifle if memory serves. Can't tell you which country its from, i'm not that up on bayonettes.

The sword bayonet for the British Enfield Artillery carbine of 1856 has a similar guard and blade. It's hard to tell what the grip and pommel look like with that re-wrap yours has. The Enfield bayonet would have had checkered slabs on the tang with three rivets.

The sword bayonet for the 1866 French Chassepot rifle also had a similar blade and guard, though the fuller on yours looks closer to the British version.

Now that's just weird because I don't think that mine has any rivet-holes going through the tang. Although now that I think about I think it does have three rivet holes . . .

I have a very similar Sword Bayonet that I bought at a local army/navy store for $45. It has an inscription on the top of the back-ridge near the guard. It's French, and bares the year 1873, as well as having the number 2 stamped on the side of the blade. The one-piece grip and pommel on mine is cast brass, and the tang is very noticably peened through the top of the pommel. One interesting thing I've noticed about mine is that the blade is hollow; I can hear things moving around inside it when it is inverted.

Compared to yours, one difference I see is that the fuller on mine runs all the way up to about a quater of an inch from the guard, getting wider on the way. Another one is that mine has either a rivet or bolt (too rusty to see) closing the loop around where the barrel would go through. Also, my grip/pommel has a total of 5 rivets. The largest comes out from the left side of the pommel (when held in the hand). The remaining 4 are on the grip; 2 on the left and 2 on the right.

I almost forgot, mine has an all-iron scabbard with very feint diamond and S shapped patterns on it. I'd be interested in knowing if your has a scabbard as well.

The hollow blade is a very unusual feature, can you tell how it was made? As in was it cast, or forged hollow. I'll go out on a limb and guess that it was made hollow in an attempt to keep the weight of the weapon down.
I have no idea if mine had a scabbard but logically it must have had one of some form.

For reference:

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1856 Enfield

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1866 Chassepot