Sterling Silver Pueblo Navajo concho signet ring

Navajo (or Hopi?) Concho signet-type ring, marked STERLING(sterling silver). Vintage ring as I inherited it, but not my size. Size 13.75 (seems to be slightly bigger than 13.5). At its narrowest it is 5/8" inches (8mm) wide, and face of the ring is 1-3/8" inches (30mm) tall in good condition with some use but no abuse. Ring is still round. Oxidized background is still dark. An attractive ring with that Native-American make, could use a good professional polish/clean but will leave as is.