Philatelists and numismatists and are being asked to pay $188 for a $5 stamp and a $10 coin. The Hong Kong Monetary Authority yesterday announced it would issue a first-day cover with a built-in coin to commemorate the opening of the Lantau Link bridge. It will be the public's first chance to own any of the coins being issued to commemorate the handover. Coin dealers are expecting all 30,000 being offered in Hong Kong to be sold immediately. Another 20,000 will be sold overseas. Ng Man-fai, manager of the Man Fung Coin Company, said those lucky enough to get one could expect an immediate profit. 'People in China will want it too, even though it is a little expensive,' he said. The long-planned $10 coin has a bridge design, and when the authority discovered the Post Office was to make a stamp to commemorate the bridge opening, it decided to follow. Like previous commemorative coin issues, profits go into a charities fund. Authority spokesman Albert Chan Yu-chung said anti-speculator measures would ensure applicants could only get one each. Applications will be accepted only by post, and must include ID card numbers. When the lucky applicants are selected in a ballot, they must show their ID card when they collect their cover. 'We don't want to have so many that people won't find it worth collecting. Neither do we want to issue so few that people would say we should have produced more because the second-hand price rose a few times. It's a delicate balance,' he said. The full commemorative set of handover coins, made by Britain's Royal Mint, will be issued later. Huge numbers will eventually be circulated.