Thank you for posting these links! I was interested to read that the mottled PPs that we have should have a higher percentage of white. I was wondering what the standard for this breed is and found it on one of the links you posted.They come from Northern Spain and were nearly extinct. Spain started a preservation program and they were preserved along with other Spanish Breeds, including the Basque Hens in the 1980s. They are still listed as being in danger of extinction.
Another name for the is Asturian painted hen: http://www.ultimatefowl.com/wiki/index.php?title=Asturian_Painted_Hen
http://showchickens.com/chickenbreeds/asturian-painted-chicken/
http://www.lapitapintaasturiana.com/en
http://www.lapitapintaasturiana.com/en/racial-pattern