I've received an email from George from Taiwan about my last two articles, indicating me that he has some doubts that those stamps have actually been used in China. He thinks that they were used only in Indo-china (i.e. what is now the Vietnam). This is not what is indicated in my Scott catalog, and not what I found when reading several pages on various websites... but still, now I have a doubt. So the debate is open. Any information in one direction or the other is welcome.