Well, I think now, more than ever, that the whole clock is a modern reproduction. And of course if the case is not old, then having a new movement would not be surprising, because it would not be a replacement, it would be the original.
The casting of the figure on the top is very poor quality indeed and not what a French clock of the period would have. The gargoyles or whatever they are look very odd and not French.
I can't make out exactly what the strange wooden (?) box is underneath, but I would not have expected that either.
As for the signature, I think it is an oriental attempt at something intended to look like a French sculptor's signature. There are many French figural clocks in this style which do have the artist's signature in this position, but to me this one does not look genuine. (This is not an uncommon thing, I have a late 19th/early 20th century Chinese clock with a crown-wheel fusee movement, on the back plate of which is a desperate attempt to engrave what I think is meant to be the word Junghans. The result is just a jumble of worm-like marks!)
Is what I think - but others may have better ideas and I shall be happy if they can prove something else.
JTD