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using older stamps for postage

ad4400ad4400 Posts: 2,030 ✭✭✭✭✭
I inherited a litteral suitcase of sheets from the 1940s- 1970s of common US material. I've been using them as postage for domestic mail. This may be somewhat off topic but can I simply affix enough of this older postage to get a letter to France, or does sending a letter to France require an air mail stamp?


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