Marshall Islands Milestones of Space Exploration $50 Proof Coins. 999 Silver
999 silver, commemorating Milestones of Space Exploration. Minted in the Marshall Islands in 1989 by the Republic of the Marshall Islands, these coins contain a total precious metal content of 24 ounces of silver. Each coin contains one ounce of silver and is uncertified, making them a valuable addition to any coin or bullion collection focused on space exploration or unique minting locations.