Patek Philippe

SuitbertW
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It's a "normal" metal dial.....

Hello,  Erich,
first, welcome to the forum!

I can't tell you more about this specific reference, but I'm pretty sure about the dial.
It's a normal metal dial with (as one can easily see) applied Breguet style numbers. The "writing" is done in a special process, often refered to as "guilt write".
The dial starts out as brass blank, all surfaces are polished/brushed/ or however it's thought to be when finished - often surface treatement is  different throughout certain areas - brushed versus polished versus brushed in a different direction.....
Now, the dial is electro plated (galvano plated) the way the later printing should appear - in your case gold. I.e. one could simply polish the brass blank or gold plate it for a more "vivid" gold colour.  
The next step would be to print the writing with some sort of protective varnish (even normal print colour would work). 
In your case this would be the minute track, PP signature and seconds subdial (track and numbers).

The dial now  is again electro plated, but contrary to the first step part of the surface is protected by the varnish (or colour) and thus doesn't receive any plating. In your case the black surface could be black nickel, black rhodium, black chromium or some sort of galvanicallly aided oxidation process. The mettallic black coatings usually are created by adding special chemics to the base metall bath, special salts or likely.....

To complete the process, the protective varnish (the printing/writing) is removed (with help of  the usual solvents like aceton for example) and  the writing will appear gold.
Last step is a protective transparent varnish to prevent oxidation or tarnishing. 
Again, in your case we'd have to add the applied numbers now, normally attached to the dial with tiny "feet" and holes in the dial. 

Thoas dials are absolutely stunning and also have something in commonn with enamel, at least a tiny bit  .....they are by far more resistant to aging (compared to normally printed  dials), although not as good as enamel in that regard.

Back in the 20/30ties untill the early 60 ties this was a very common way   to make dials, but today seems to be a little bit a "lost art".  I'll make some pictures of good example later, if someone is interested.

BTW, this process is open for additional steps, i.e. colours and metalls. Sometimes it's gold, silver, black and grey.....or even more ! 
Some specific treatements also had the tendency to change colour dramatically over the years some, sometimes that's absolutely beatifull as well.

Best regards
Suitbert

p.s.: Totally forgot to add, it's a beauty! And great condition as well, do you happen to have a movement picture??