Need Assistance w/ Artist Identification on this Large Pendant/Pin

[Steve]

this thread might help narrow it down a little

https://forum.turquoisepeople.com/t/cow-skull-with-feather-hallmark/4584

Cow skull with feather hallmark

Could not find it in any of my books… maybe a shop mark? And what kind of turquoise? Any ideas? Thank you for any clues as always… [20190613_115145] [20190613_115129]