Australia Silver Medal "Brisbane Convention" 1991. Gold plated Silver (.999) 31.37 g., Proof; Obv: A kangaroo with a lion in a bag with a flag on its left shoulder, and the inscriptions: "KATARINA - ONE TROY OZ. - .999 FINE SILVER"; Rev: Brisbane City Hall, a lion facing left in the background, and the inscription: "BRISBANE CONVENTION - 1991"; With the certificate