Olam, Elec, Eski, Mukry, or Chatab Turkoman wore this style of longer cuff with primitive engraved designs. This one quite old and having a beautiful patina. Once in my private collection. Olam groups lived on the borders of the Amu Daryu river region spanning several countries such as Afghanistan in the north, Tajikistan, Uzbekistan and Turkmenistan in the south.
Open back, makes it easy to fit. Late 19th c.