Most silver eagle collectors own the regular Brilliant Uncirculated issues, whose mintages are fairly substantial. The most beautiful and desirable form of these popular bullion coins are the spectacularly minted proof issues. These impressive dollars feature deep-etched frosted engravings and dazzling mirror backgrounds. Each year, far fewer are issued in this format. Shown is Lady Liberty clad in the Stars and Stripes and a unique rendering of the Presidential Seal.