Navajo Style 925 Sterling silver Pendant marked Nowinska Turquoise Amber Mixed

Beautiful Navajo style sterling, silver and multi stone pendant. I cannot be 100% sure this is a Navajo piece but it has been signed and marked on the back. I have research the name I have not come up with anything. Maybe you could dig deeper. Name sounds Polish to me. See all photos for details and measurements. day shipping. Thanks.