Thank you Michael,
I uncovered my own Walllace (and gromit) USB stick and looked the pistol up.
The buttstock seems weird indeed, there where the bone begins. The wood surrounding the locks is bigger (wider) and all the sudden, when the bone "ring" starts, the wood has a very weird/steep rounding to it?
the green lines show how the stock, in my opnion, should have progressed (with of course some degree of curvatude). The red circle shows the area i am concerned about. The bone plaque of the trigger is also not smoothly lining up with the "ring" of bone.
And to be honest, i find the whole bone "ring" somewhat large? It doesn't look proportioned to all the other subtle ornaments and engravings. But i lake the knowledge to make a well founded argument (currently reading baxters superimposed loads firearms book though, so some knowledge should be sinking in)