Identifying southwestern hallmark
Can anyone help me identify a southwestern hallmark on a necklace I recently acquired? It looks like a half sun with 6 rays on the top and the word sterling under the half sun. I was told that this could be from a line that J C Penneys commissioned from native Americans when they opened their store in Tucson - the line was called the native American Collection according to the seller... but I cannot find anything on this line when I search the internet. It is also not in my Hallmarks of the Southwest book. Any info would be appreciated. The piece has a beautiful turquoise heart at the bottom with variscite stars and spiny hearts leading to the heart. Only the heart is stamped with this sun hallmark. Thanks for any info -