with beautiful pictures, thanks for it!
I didn’t know that Roth was also at Breguet, I was aware of the fact, that he worked for Audemars. But if I compare the dials of the first Roth watches with these Breguet’s, the similarity is obvious.
As for the guilloching: I think Martin Braun wrote me once, that every guilloching is a machinery-guilloching, the only difference is between a hand and machinery guilloching is the issue, whether the guilloching machine is handled by the watchmaker or a robot. Or maybe I misunderstood anything?
Yours,
Adam