31.1 (1 oz). The item “Niue 2016 Mars Martian Meteorite NWA 6963 1oz $1 Silver Coin NEW” is in sale since Friday, July 15, 2016. This item is in the category “Coins & Paper Money\Coins\ World\Australia & Oceania\South Pacific”. The seller is “worldinvestcompany” and is located in Antelope, California. This item can be shipped worldwide.