Stamp collectors have left Hongkong Post embarrassed after uncovering a glaring error in a new line of stamps released to mark an exhibition in Bangkok next month. A first-day cover promoting the stamp collection and on sale for HK$1 since last week states Bangkok 2007, the title for the 20th Asian International Stamp Exhibition, is under the patronage of the Federation Internationale de Philatelie. But the event is only being sponsored by the much smaller Federation of Inter-Asia Philately - leaving collectors, exhibitors and both federations angry. The error is also on the presen- tation pack to be issued with a HK$10 miniature sheet on August 3 to commemorate Hongkong Post's participation in the exhibition. Chairman of the Hong Kong Philatelic Society Andrew Cheung said stamp collectors were a notoriously fastidious bunch and the error was damaging to Hongkong Post's image. He said it could even stop the city hosting future international stamp exhibitions. 'The international body was not impressed to hear of the error and neither were the exhibitors from Hong Kong who are going to Bangkok,' he said. 'This is a big deal and they just shouldn't get things wrong like this. They [Hongkong Post] told me the error happened because they just copied the information from the Thailand Post website - but the error in Thailand was corrected six months ago.' Secretary of the Federation of Inter-Asia Philately Jasmine Soh has asked for the mistake to be corrected or for the first-day cover to be withdrawn from sale. A spokeswoman for Hongkong Post said post offices had been told to tell customers the information on the first-day covers was incorrect. She blamed 'confusing information' issued by the Bangkok organising committee for the mistake. Five exhibitors from Hong Kong and three judges, including Dr Cheung, will attend the Bangkok exhibition.