Australia, 'The Perth Mint Centenary Sovereign 1999' a bi-metal gold & silver proof coin struck to commemorate the centenary of the opening of the Perth Mint in 1899; the coin comprises a gold centre with the same specifications as the original Perth Mint sovereign with the Queen's portrait by Rank-Broadley & the Pistrucci St George & Dragon rev (with the Perth centenary mintmark P100 in ex. in place of the date) the 22ct gold centre is surrounded by a .999 silver border with the obv. legend 'ELIZABETH II AUSTRALIA 100 DOLLARS' & rev. legend 'THE PERTH MINT CENTENARY SOVEREIGN 1899-1999;' total weight 13g, diameter 32mm; limited edition of 7500 (this coin No. 3542), with certificate of authenticity, encapsulated in a small wooden case inside satin-lined box of issue, FDC