Are all blue toned coins AT ??
I might free this guy to natural air to see what color it turns !!
Mongolia 2005 silver and niobium bimetal proof coin
The world’s very first Niobium and Silver coin, issued in honour of the endangered Mongolian Snow Leopard, this uniquely shaped oval legal tender coin is crafted to faultless Proof quality. Measuring 30mm down and 45mm across, and weighing 25g, the design of the Leopard has been struck exclusively in Niobium, encircled by sterling silver. This coin is presented in a clear plastic capsule with Certificate of Authenticity and timber case.

Niobium
"Niobium is a shiny gray, ductile metal that takes on a bluish tinge when exposed to air at room temperature for extended periods. "
Mongolia 2005 silver and niobium bimetal proof coin
The world’s very first Niobium and Silver coin, issued in honour of the endangered Mongolian Snow Leopard, this uniquely shaped oval legal tender coin is crafted to faultless Proof quality. Measuring 30mm down and 45mm across, and weighing 25g, the design of the Leopard has been struck exclusively in Niobium, encircled by sterling silver. This coin is presented in a clear plastic capsule with Certificate of Authenticity and timber case.

Niobium
"Niobium is a shiny gray, ductile metal that takes on a bluish tinge when exposed to air at room temperature for extended periods. "
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Jerry