That's a new one to me. Hard to tell from the photos if its scratched (probably locally applied) or stamped (probably original).
Best guess at the moment would be a stamp on the steel used for the blade. As the sword overall doesn't look particularly old it could be made from recycled steel in which case this could make some sense.
Otherwise its nothing like traditional talisman markings and copies of older European marks I've seen on takouba.
Interesting thing for sure. Is it owned by a friend of yours and perhaps we could get better images?
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