Hi Jeff,
I knew I could count on you to respond!!!
We have always seemed to share the same interests and it was great to be able to bring up this thread on the Custer sword. It also seems that these swords have a great deal of mystery due to the legendary tales attached to them.
The sword you have posted is intriguing also, especially the Lakota tradition about its being captured at the Little Big Horn. While it is known that Custer ordered all sabres to be left at Powder River I believe, it seems that one Native American account notes that there was a single 'long knife' there, without further description. So I suppose it is possible, much as with these iconic battles including the Alamo, the mysteries will never be solved.
It is not surprising to see the Solingen blade on the M1821 British hilt which would have been quite likely in Canada, although it seems if would be regimentally marked. Many of these Solingen cavalry blades were used for U.S. sabres, especially the M1840. It also seems that there are numerous instances which illustrate Native Americans had cavalry sabres, but the use seems ceremonial and these had elaborately decorated cases, and of the examples seen, they appear to have British hilts. Since the Sioux tribes moved across the Canadian border so frequently, it would seem plausible that these swords might have come from these regions. In other cases where U.S. troops did use swords, a number of them were captured as well.
Thanks for answering Jeff and especially for sharing the photos of this sword.
All the very best,
Jim