Answer (1 of 4): Yes. As long as the value of the stamps used is enough to cover the postal rate for the international mail being sent.
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Can the second ounce stamps be used as regular stamps to send without a forever stamp or on international mail? - Quora
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I'm trying to mail a letter to Canada but I don't have a forever stamp. Can I use regular stamps instead? If yes, how many? - Quora
Can the second ounce stamps be used as regular stamps to send without a forever stamp or on international mail? - Quora