The gold colour matches the closionne enamal dial the most!
Think, the Patek initilally just issue 5131J and there is no 5130J...that means they try to "spare" the YG case for the precious dial!
Dear Aussie,
Please check in Patek official website...Only 5130 P, G, R.
Of coz, if you are the VIP of the Salon, you may ask Mr Stern to specially make one for you...
i dont think theres ever been a 5130J.. you might be thinking of the 5110J
cheers
.... the collector takes ownership of the watch is a holiday in itself... i'd mark that day in the calendar...
bests