首日封 meaning in Chinese

first day of issue
first-day cover
firstdayofissue
the first day cover

Issuance of the lantau link philatelic numismatic cover
发行青屿干线纪念币首日封
Datestamped first day cover with a set of stamp - st . jame s palace
已盖销首日封连一套邮票-圣占姆士宫
Press release : issuance of the lantau link philatelic numismatic cover
新闻稿：发行青屿干线纪念币首日封
Datestamped first day cover affixed with a stamp sheetlet hk $ 8 . 5 per cover
贴有一张邮票小型张的已盖销首日封

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