2020 Niue Mortal Kombat Arcade Design Box COA 1 0z Silver Proof. The item "2020 Niue Mortal Kombat Arcade Design Box COA 1 0z Silver Proof" is in sale since Friday, February 19, 2021. This item is in the category "Coins & Paper Money\Coins\ World\Australia & Oceania\New Zealand". The seller is "mongojacksonfranklin" and is located in Abington, Massachusetts.