Igbo Bochie or Twisted Manilla Currency

A twisted green coil wraps itself three times, ending in knotted knobs.

This bochie or twisted manilla copper currency is Igbo, from Central Nigeria, West Africa, and dates to the 20th century. Manillas are open metal rings or bracelets, usually of copper or brass, that were traded in West Africa and widely used as currency, including among the Igbo of Nigeria. A thick rope-twisted band coiled into three stacked turns, ending in knobbed loops at both ends. The surface is crusty with blue-green and brown corrosion, and the twist is crisp along the upper ridge. It is 3.5 inches wide, 1.5 deep and 3.5 high.

It twisted its own arm and stayed twisted.