I would think its just a simple failure on the part of the engraver to understand the numerals.
In the same way that westerners wear T-Shirts with japanese logos on them that turn out ot be gobbledegook, and Japanese teenagers wear ones with 'english' logos that range from misspelling to downright rude.
I would think the maker wanted to add a European inscription and something went wrong.
That said, I think the numerals look very early 19thC or earlier.
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