Just bought a Blue PTT T65 de Luxe model on Etsy today for €29.00. All I know about these phones is that the standard color of these were the gray ones and the deluxe models came out a few years later. How rare is the color of this particular phone. I am just proud to have one of these phones!!
A while back I wrote an article about the T65:
http://www.telefoonmuseum.com/index.php?option=com_content&view=article&id=49:the-t65.. (http://www.telefoonmuseum.com/index.php?option=com_content&view=article&id=49:the-t65..)
Colored versions of the T 65 were introduced in the Arnhem telephone district on October 1 1972.
At the introduction, the T 65 "de Luxe" was available in five colors: Emerald green, azure blue, ruby red, ivory, and orange.
The azure blue T 65 (dial), was discontinued in 1977; a new color mocha (dark brown) was introduced.
The blue one was produced for a limited time which makes them a bit harder to find. The blue one is one of the colors that fades easily so keep them out of direct sunlight.