Hi Glen,
          I did a swop for this sword but it was purchased at an auction in England in a lot with a 'cutlass thought to be American'. The buyer wanted the cutlass but not the eagle head and I had something he wanted so we exchanged. I'm afraid that is the only info re provenance I have. 
          I came across another couple of conflicts which would fit inside the time frame 1830's/40's, the Black Hawk War and the Texas Revolution. I noticed that the inside right angle on the simpler guards differ from plain to being accented with various small decorative details, wondering if this is a possible pointer to origin. Finally, I'm sure you will be aware of this little paper but here is a link anyway 
www.asoac.org/bulletins/92_bethune_patriotic.pdf 
          Thanks again for your time and effort on this.
My Regards,
Norman.