I have several pieces of Turquoise Jewelry with a Fox Hallmark. I have not been able to identify the maker or the shop it came from. Can anyone tell me about this hallmark? http://h.imagehost.org/t/0681/DSC_0018_1879_edited-1.jpg http://h.imagehost.org/t/0399/DSC_0017_1878_edited-1.jpg .