Hello Ken, I think you have something quite special there and agree with David in that its an old design. I have never seen companion knives of that design before but on searching online I found a kukri with companion kives having the same blade form as yours, I found it together with the knife, scabbard and pouch on Pinterest who attributed it to the Metropolitan Museum. The age given was 18th/19th century.
Thanks for sharing.
Miguel
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