Two of these unused 4-3/4″ x 6-1/2″ cards are available. They were issued by the Hong Kong Government in 2003 as an incentive for residents to invite their friends and family to visit. The cards have a photo of the airport printed where the stamp would go, along with a legend that airmail postage has been paid and is valid through the end of 2003. Quite unusual, and desirable. Grades: 1