Time aftrer time our QSL manager received more and more invalid IRC in your QSL request mail. Invalid IRC has not been used at post office for mail franking. Your QSL card with invalid IRC can not be confirmed. If you do not check validity of your IRC, you may get a trouble: QSL manager do not reply your request. But reason will not be at QSL manager side. He had to pay QSL card email himself.

Back IRC

You propably know this type of IRC. You may use it ordinarily. But, if you have it too much, send they as soon as possible. Its validity is limited and new type will be used at future.

Invalid IRC

Invalid IRC may be identified by postmark on the right side. The valid IRC has postmark only at left side or else in the center may be price of IRC.