Stunner! vtg unsigned Southwestern cuff bracelet

Gorgeous! Cuff bracelet with incredibly detailed raised ovals and engraved designs that are in Navajo art style. Says "Sterling", is not magnetic, has some tarnish, and has good heat conductivity. The polish test for sterling was inconclusive: it produced a brown smear instead of black, but this bracelet was stored next to one with brown enamel. No maker's mark. 1/2" across, and 2 1/2" at widest part. Sixth photo shows thickness of metal, probably about 1 mm. Lovely patina, minor wear, but overall Excellent Used Condition!