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英国“黑便士”邮票的左右下角各有一个英文字母。左下角从A至T共20个,右下角从A至L共12个,邮票全张为20(横)×12(竖)=240枚。
British “black penny” stamps have a lower left corner of each letter. Lower left corner from A to T total of 20, the lower right corner from A to L, a total of 12 stamps for the 20 (horizontal) × 12 (vertical) = 240.