Because of the extreme emphasis of Koreans on education there are, even today in times of digital communications, a lot of stationery shops in Korea. These shops sell hundreds and sometimes even thousands of different products, one of them being whole series of sticker stamps. These stickers look like stamps because of their “perforation” and they come in all sorts and designs, but of particular interest to me were the stickers resembling actual stamps.
While living in Korea I sometimes sent mail through the Korean postal system. At one time I wanted to see what would happen if an envelope would have no postage on it. This created a nice postage due cover. But what would happen to completely fake stamps if an envelope did contain enough real postage on it? Would they be cancelled or would such an envelope come with some marking stating “Don’t use fake stamps!”? That last thing didn’t happen, but sometimes postal workers did cancel these fake sticker stamps, apparently mistaking them for real stamps. Here are some examples: