Vintage Signed Native American Navajo SterlingSilver Thunderbird Ring Size 6.75. Band Width appx 10 mm. This vintage Native American Navajo sterling silver Thunderbird ring is a unique and handmade piece that showcases the rich cultural heritage of the Navajo tribe. Originating from the United States, this ring features a Thunderbird design, which holds significant spiritual meaning in Native American culture. The size 6.75 ring is a collectible item that represents the artistry and craftsmanship of Native American jewelry from the 19th to early 20th century.