London 2012 Olympic Triathlon 50p (2011)

A runner, a cyclist and a swimmer share one coin, which makes it one of the busiest and best-looking designs in the sports series. At 1,163,500 it is the most plentiful of the four scarce Olympic coins, but only by a whisker. Behind those four, tennis is the next scarcest at 1,454,000, and the rest of the set runs from about 1.6 million to 3.3 million, so most Olympic coins in your change are worth a look but few are worth a fuss.