I notice they are not labelled "guilloche main" the way a Breguet guilloché dial is, for example. In particular, the pattern of grain d'orange is the same as that of one of the boutique only Vacheron Constantin traditionelle small second models--and in the case of the VC the dial is not guillochéd by hand with a rose engine. VC is honest about this and never uses the term guilloché to describe the dial. So, while grain d'orange can be done by hand guilloché, it can also be done by other means. The lack of a "guilloché main" mark makes me think it might be done another way.