I can't think of any reason outside of an original case being damaged beyond repair while the movement was still working (very, very unlikely).
If the case was Swiss, that mark on the left would be a squirrel - I don't see that, no matter how worn. I wondered if it was Dutch or Danish but, again, the marks don't make sense. Maybe
@Syrte could comment on whether it's French?
What I will say is that looking at the buildings in the decoration, I would expect the case to be the low countries or maybe Scandinavia?
Best guess, I'm afraid.
I'm sure if you search European gold marks and just check "images" , you'll find a match. I thought one might be Danish but came up dry. The Swiss used animal heads and such but they don't match either. Perhaps
@Syrte could say if they're French or not.
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