International Labor Day, 90th anniversary: Hammer and Sickle “51” and Bars from “International” - 纪念“五一”国际劳动节90周年: 镰刀和锤子组成的“51”字样，上端是国际歌乐谱 8f Multicolored
- Country People`s Republic of China
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Denomination
?8fFace value of a stamp, usually printed on the stamps.— Glossary
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Color
?MulticoloredOriginal catalog color of the stamp.
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Print method
?PhotogravureMethod of process of imprinting designs on paper.
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Perforation
?11Holes punched between stamps to make separating easier.
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Watermark
?UnwatermarkedA pattern embedded in a paper during stamp producing process.
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Issue Date
?Date inscripted on a stamp or cancellation for used stamps not necessary correspond to real date of stamp issue.
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#
?Catalog number of stamp.
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