There are also special edition R.C.M. coins called the 'Maple Leaf Forever' series, with there being three maple leaf symbols on the reverse. The mint has minted 100,000 of this design in 1/2 oz .9999 fine silver coins and 200 strikes of the same design in a large 60mm diameter .9999 fine gold coin. Many other Royal Canadian Mint coins feature maple leaf symbols, such as the $20 for $20 series, the 'Piedfort Maple' series, the 5 oz silver 25th anniversary coins, 1 oz silver 25th anniversary coins with gold guild clad (an identical coin is minted in 1 oz of .9995 fine platinum) and fractional 25th anniversary coins in silver and gold. There are also the 1 kg $250 coins 2011–2015 with mintage numbers 999, 1200, 600, 600, 500 respectively.