Thanks very much Dmitry for finding this, which as Norman says, looks very much like the customs, police etc hangers in England and Europe of 18th 19thc.
David, excellent observations on the modification potential for this blade also. As always, your acumen at these forensics is outstanding!!
The Confederate blade idea was fun, but clearly not as plausible as I hoped.
Still a most interesting West African sabre......the Confederate concept better for a good plot

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Thanks very much guys!!! Well done,
All the best,
Jim