Sir, you should really learn some jewelry basics before talking about science and research. Here is link for your education what does mean hand engraving. https://www.youtube.com/watch?v=lpEnRKk6VIg
Seriously Hapur, have you ever watched at a TK ring and its engravings?
Anyway: how many dies used Gahr following your theory? 1 die for '30 2-3 dies for the transitionals and 1 die for the '40?
Or is this another of the questions that cannot be answered at?
