CoinWorldTV 1888, Prussia, Frederick III. Beautiful Gold 20 Mark Coin. Mint Year: 1888 Reference: KM-515. Mint Place: Berlin (A) Denomination: 20 Mark Material: Gold (.900) Diameter: 23mm Weight: 7,95gm Obverse: Bust of Frederick III German Emperor and King of Prussia right. Mint letter (A) of Berlin below. Legend: FRIEDRICH DEUTSCHER KAISER KÖNIG V. PREUSSEN Reverse: Crown of the G ...