Depollier or Waltham pocket watch?

I've recently inherited my grandfathers pocket watch. It's a Depollier but I've heard it may be a Waltham either. There seems to be a lot of knowledge on Depollier/Waltham here so maybe someone might be able to shed some light on it.
Here are a couple of pics of the face and the inside. Would anyone here have seen similar? I've been looking online and have seen a few similar but nothing matching it. Thanks