FabR[Senior Patek Moderator]
26166
You'll actually be surprised that Donze Cadrans did make some of these enamel dials for Patek in the past! ;-) I'm not sure whether this specific 5075 is due to them, but they certainly did some of the enamel work for the 5075 line around that time :-)
This is of course no longer the case today, and DC mostly works for Ulysse Nardin, by which they were acquired in 2011 ;-) Cheers.