Source: Saudi Arabian Monetary Authority (SAMA) currently the Central Bank Occasion: 75th anniversary of Aramco's founding (2008-1933) Metal: 999 fine silver. Weight: One ounce (31.1 grams). Diameter: 40 mm. Year of issue: 2008 AD (1429 AH). A silver commemorative medal, not a circulating coin. It was issued in a limited edition to commemorate the 75th anniversary of Aramco's founding (1933-2008). Issued during the reign of King Abdullah, may God have mercy on him.. Price 450 riyals. Unfortunately, the certificate accompanying the medal was lost..