I am having trouble locating this mark. It is on the back of a necklace pendant. It appears to be american but I am not sure. please help!! http://farm2.static.flickr.com/1057/624624114_5a280b4d5f_m.jpg http://farm2.static.flickr.com/1048/624624092_37238be23f_m.jpg http://farm2.static.flickr.com/119...