1997 SILVER PROOF BRITANNIA COLLECTION. FIRST YEAR OF ISSUE. 4-COIN BRITANNIA SILVER PROOF SET. BOXED SET WITH COA. 1997 was the First Year of Issue for the Silver Britannia, mintage 15,000 4-coin sets. Denomination = 50p, Min Fine Silver content 1/4oz, weight 8.114g, diameter 22.00mm. Denomination = 20p, Min Fine Silver content 1/10oz, weight 3.246g, […]