Gold investors can buy gold coins from bankers, but not all banks sell coins, only some of them do. Banks that sell gold coins will sell authentic coins.This is designed for the new investors with gold, especially if you do not know of any silver broker or dealer yet. Banks That Sell Coins-A Safer Method to Buy Them.Gold investors can buy gold coins from bankers, but not all banks sell coins, onlysome of them do. 2  Banks that sell gold coins will sell authentic coins.