2017 50 cent Sir Jack Brabham Coloured Uncirculated Coin. The story of three-time Formula One World Champion Sir John 'Jack' Brabham AO OBE is one of the brightest chapters in Australian motor sport history. Fifty years on from the prestigious achievement of winning the Formula One World Drivers' Championship and being named the Formula One World Constructors' Champion the same year (1966), the Royal Australian Mint commemorates the life of Sir Jack Brabham on this 50 cent coin. Sir Jack's legacy of passion and commitment towards motor sport has continued to inspire people globally with his driving skills, engineering vision and endearing demeanour that will never be forgotten. Mintage 30,000.