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Why do the stamps in the 1998 issue commemorating He Xiangnings paintings (#2880-2) seem to have missing perforations along each short side?

April 26, 2017commemorating ISSUE MISSING paintings perforations short stamps

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Why do the stamps in the 1998 issue commemorating He Xiangnings paintings (#2880-2) seem to have missing perforations along each short side?

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Actually no perforations are missing. The stamp designers decided that a punched out ellipse (blimp shaped figure for you non-mathematicians) would look neat in center of each row of perforations on the short side of each stamp instead of the two or three normal perforation holes one would expect to find there. The effect can best be seen by examining a block of these stamps.