958 Silver Proof 4 Coin Collection Royal Mint #041 w/ Box COA. We travel coast to coast to find some of the highest quality coins available for our customers. Many of these coins come from private estates where the coins have been tucked away in a safe for decades. We also work with numerous coin professionals all across the country to source new and fresh coins to make available in our store. We’ve done the hard work of finding these beautiful coins. This is your opportunity to add some amazing coins to your collection that haven’t seen the light of day for many years. We always guarantee that the coin you see is the exact coin you’ll receive. Powered by SixBit’s eCommerce Solution.