Hello, I'm a teacher of Shanghai No.60 high school. I'm also in charge of a student group named YunYou group.
Mainly, Our group collects the postmarks from everywhere of China. We have had the postmarks form each province of China. We have collected many valuable postmarks. For example, the one from the highest post office of China even of the world, and also the one from the space post office of China.
Looking forward to your contection!