Knife with interesting markings - Ebay

[David]

This is their current insignia, but i am certain that the design would have been different back then, though it still probably maintained the same elements like the bugle.

[David]

Also the symbol on the reverse side from the triangle and sun looks like a cavalry flag, does it not?

[Rick]

Originally Posted by David

Also the symbol on the reverse side from the triangle and sun looks like a cavalry flag, does it not?

Very much like a Guidon, David .
The trumpet insignia on the scabbard looks old fashioned; perhaps a holdover from the Civil War ?