Need Help Identifying Mark...Thanks

I have a couple of pieces of Navajo, turquoise and silver jewelry that has are signed with a lightning bolt, three raindrops and the letter G. I believe that these pieces are pre-1960s. There is no silver mark on either piece, but I’m fairly sure that they are sterling silver. Can anyone identify the maker and probable date? Thanks so much!!
Vintage Navajo Jewelry Mark ID

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