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First day (of validity)

First day (of validity)

first day on which a stamp is valid or a special postmark is used

en-US/ˈfɝst ˈdeɪ ( ʌv vəˈlɪdɪti )/

en-GB/ˈfɜːst ˈdeɪ ( əv vəlɪdɪtiː )/

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philately publication date point in time