Yet I see in many auction catalogs and books that even if it has only 3 prongs, it is still listed as mark and period. Why is that. To simplify matters I enclose one as far as I am concerned, genuine mark. This information is given as an example of private conversation only and is not intended to be used as a promotion of any individual piece.
All opinions is the authors and is given as such with all hazards of judgeing anything from a photo.