In this case, pre-2004 cupronickel 1 peso coins of the Philipines. According to
a story in the Manila Standard by Roderick T. dela Cruz, “In 2006 it even discovered that an international syndicate was smuggling out the copper one-peso coins”. The central bank switched to nickel-plated steel.
The purpose of dela Cruz's story is to urge citizens to spend their old coins to relieve the Philipine Central Bank the burden of minting new ones. “The central bank always loses when minting coins with a face value lower than five pesos because the average cost of minting them is two pesos per coin.”
Amazingly, not only is the Philipine Central Bank minting 1 peso coins at an expense of 2 pesos, it is also minting 1, 5, 10, and 25 centavo coins, although one
web page suggests the 1 centavo coins cannot be found and the 5 centavo coins are mostly used as decorations. A peso is worth 2.4 US cents; 25 centavos would be 0.6 US cents.