Hi Robin,
got a quick reply, so I can provide some more details. The dials of the Laureato are stamped. GP also does some hand guilloche, but the quantities of the Laureato make that not possible. Hand guilloche is mostly used on the Haute Horlogerie watches.
The option to use CNC machines is possible, but they do not provide the same finish and charm that the stamping can do.
Hope that helps.
CC