I especially like the rather special semi-shrouded lugs. They are 1/2 cut away on the backside (easier to see the effect from the front on the top pair of lugs in the advertisement picture you posted).
Also, be very careful with the hands in service - they are very much NLA (no longer available).
thank you all guys... luckily it arrives fully serviced (according to the seller), and indeed is keeping time and power reserve very good ... the lugs hide part of the strap, so the strap looks more integrated to the watch (very nice touch)
one day in my quest, I will find original dial & hands in better condition ... there are ones @ chrono24 but it is not for the Port Royal