Hi Juko,
I personally buy my GP?s because of both aspects, I am also an owner of a ref.2599 and now a ref.4952 both watches have in-house movements and cases as well as designs and this makes them very special because this combo is very rare among watch brands.
GP is a true "manufacture" that is still under appreciated even among watch enthusiasts that are biased towards the more obvious choices and makes it an insider secret for true purist!
Best wishes,
Rafael Valdes
Guatemala.