The explanation needs to be long, and the set needs to be a bit expensive.  In 2024, Hongkong Post issued this set of eight “Postage Prepaid Picture Card Series No. 76”, printed with stamp replicas good for global posting.  Our scan shows you how our (unopened) sets look, front and back, with original price on the outer wrap removed so as not to confuse anyone.  We have one set with no postmark; one with a Philatelic Bureau postmark; two sets with a mouse ears postmark (in the scan); and one with a more standard GPO postmark.  These sets are unopened, so we don’t know precisely what each card shows, but we do assume they will show various characters like variations of what you see here.  Make your choice!  Really, iconic for Disney card collectors.  Each set is Grade: 1.