A clerk who used change machines to launder counterfeit $10 coins was jailed for 14 months yesterday. Chim Hau-sing, 24, admitted two charges of passing a total of 130 fake $10 coins which were minted in Shenzhen, and possession of 204 similar coins, the District Court heard. Judge Peter Longley told Chim that the offences had harmed innocent people. The judge said the number of fake coins involved was large and although he accepted Chim did not mint the coins, he was 'greedy enough to take the risk' of laundering them. He took into account Chim's guilty plea, background and previous good record before passing sentence. The court heard that fake coins were a growing problem, with police seizing 44,968 counterfeit $10 coins up to July this year compared with 25,669 confiscated last year. Police expect more coins to flood the market due to their high value and ease of production. Commercial Crime Bureau Detective Chief Inspector Yu Shi-cheung of the counterfeit and forgery division said it was quite difficult for ordinary citizens to detect the fake coins. The inspector said all the fake $10 coins found during the investigation were made in China, where production costs were relatively low. Chim was caught by police on November 11 last year at Kowloon Tong MTR station acting suspiciously at the Quick Coin Machine. He also admitted passing counterfeit coins at Tsim Sha Tsui MTR station.