BD7PPD-xiaohei-lv It's a real shame, I'm not one of the big shots.😕
Please correct any inaccuracies mentioned below (and kindly provide guidance from experienced individuals).
SASE (Self-Addressed Stamped Envelope) refers to an envelope that has been pre-addressed and pre-stamped for return.
In general (narrowly defined), a postal frank refers to an envelope printed by China Post with pre-paid postage (referring to the QSL card sent to you by the BPM at the Chinese Academy of Sciences' National Time Center). This does not include envelopes that have been pre-addressed and stamped.(SASE)(In a broad sense, you can define it as you wish)😋)
In a narrow sense, postage refers to the stamps used for sending and receiving mail within specific regions. In a broader sense, it includes stamps (used by both sender and recipient), IRCs (International Reply Coupons),And also, mysterious and legally prohibited green banknotes (whether in RMB or US dollars).
The return coupon is an International Reply Coupon (IRC), issued by the Universal Postal Union (UPU), which is a subsidiary of the United Nations. However, the UPU does not directly sell IRCs, and they are often out of stock in mainland China. The reason for their existence is that it's difficult for people to obtain postage stamps for the recipient's country, but with an IRC, this problem can be solved, and even some postage savings may be achieved (the price in mainland China is 12 yuan). Using it allows you to exchange two international standard letters at both ends between members of the Universal Postal Union. However, I suspect that domestic postal workers may not recognize or accept these mysterious coupons (at least, this is my experience):(
Let's have more experienced members answer! Welcome to those who want to exchange cards with me.
+0.1 CQ coin