Early Navajo Concho Button Earrings with Whirling Design Sterling

Early 1920-1930s Navajo made clothing buttons that were made into earrings. They are stamp decorated with a whirling design tha represents the circle of life. They are 7/8" in diameter. The ear wires are modern. 1 1/2" long with wires. Weight: 6.6 grams.