Shawn,
The color as it appears is very interesting and, if you could create that color on a speedster, it would be very pretty.
I looked on the site and at this link: http://www.356.dk/html/gallery.html the color is listed as Champagne.
There is an original Porsche color, Champange YELLOW, but I am not sure if it is an original speedster color.
When I first looked at your picture I was thinking it might be a light (or faded) champange yellow that was "changed" by the lighing and the exposure.
If you look at the other photos on the link, the same car appears to be white.
I would guess that the color is similar to the color of champagne, pour some into a glass and take a look, with the light just right it could look like the car in the photo.