The workmanship doesn't strike me as Chinese nor SE Asia.
I think the symbols and number are added later.
The number is done very differently than the moon and "stars" - the latter might be old/genuine and point to Europe, indeed.
The number doesn't strike me as anything sensible to do to a working blade (with the outer margin of the first number coming close to the [hardened?] edge); thus, I'd go for a later addition (and musea as well as collectors are known to have done dumb things to their pieces)!