Yessir; the dials of this era were champlevé; in this case, the 'print' that you see on the dial (text, chapter ring, tachy scale, etc) is not really printing at all, but rather the dial is engraved for the text and then filled in with enamel. This was performed really more as a means of preservation; 1940's era PP were not sealed from the elements, and so the possibility of water penetrating the case was a possibility. The enamel text was to provide longevity to such breaches.
The enameling provides a very interesting signature to the dial in that the text, chapter et all are raised slightly above the surface, and make for a very unique characteristic. If you look closely you can see it...
This method was not exclusive to Patek... It's present on my VC dial, too (double bonus for guilloche) ^_^...