Radboud, that was my comment mentioning pirates, and intended only to note the regions I was considering as possible for this composite piece referring to the historic pirate connections and entirely with respect to Pirate Lady's intriguing psuedonym.
Obviously I did not intend to imply this is a pirate weapon, nor anything to do with buried treasure.
I do appreciate your ratiocination and well described detail on the Blucher sabels which does seem applicable to the guard, and good observations on the blade as well as the markings. I am inclined to agree on the numbers as placed possibly being manufacturers assembly related as unit markings tend to include other letter indicators along with the numbers.
However it does seem that maritime weapons do sometimes simply carry numbers, whose meaning has long since been lost. On some British cutlass blades (M1814), some have simple numbers such as 24 or 27 etc. Not sure what these numerics mean.
Thanks so much for the elucidation, and reminder about Occams Razor (I didnt even have to look it up!)
Your wisdom and guidance in the discussion of weapons being investigated is admirable and most helpful, guess we're never too old to learn.