1938 Brass Threepence Coin Great Britain - George VI - Perfect for Birthdays, Craft - Mum, Dad, Daughter, Grandma Authentic Brass Threepence from the reign of George VI. This threepence is from circulation, but will not be damaged or dirty. The coin pictured is an example of the condition of the coin you will get. Weight - 6.8g Diameter - 21.8mm Metal - NICKLE BRASS Beautiful Brass Threepence coin from 1938. This gift is ideal for a grandparent or parent who will remember our "old money" with fondness or someone who makes crafts and Jewelry. For me I think things with history, something I can touch and feel.