It's a mystery to me for now. As it's not a regulation army pattern, I lack references (don't have anything about American swords; perhaps there is an American equivalent to Robson, but I don't have it). Brass hilt, unmarked, plain blade, no sword knot slot in guard. Unmarked suggest private purchase, if it was actually used. Private purchase suggests officer (but I've been led to believe that yeomanry troopers would, at times, buy their own). There were officer's swords with plain blades, so that doesn't rule it out. Wood grip might be replacement for ivory grip.
Closest I've seen have been yeomanry officer's swords, American mounted artillery (officer's?) swords, and Indian swords (EIC?).
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