magnifier – 放大鏡

mail – 郵件

mail bag – 郵袋

mailed cover – 貴寄封

Mailing Receipt for Registered Article – 1) 掛號(發信)執據
2) 掛號(發信)執據

margin block – 帶邊方連

marginal inscription – 版銘

marginal inscription block – 版銘方連

maximaphily – 極限集郵, 原圖集郵

maximum card – 極限片, 原圖卡

meter stamp – (postage meter), 郵資票

metered cover – 機戳符誌封

military stamp – (field post stamp), 軍用郵票, 軍郵郵票

miniature sheet – 小型張

Mint (M) – 新票