8th All-China Trade Union Congress, Peking: Cogwheels and Factories - 中国工会第八次全国代表大会, 北京：“8”字型齿轮及衬饰工农图案（齿轮和工厂） 4f Bright greenish blue

Country People`s Republic of China
Denomination
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Face value of a stamp, usually printed on the stamps.
— Glossary

4f
Color
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Original catalog color of the stamp.

Bright greenish blue
Print method
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Method of process of imprinting designs on paper.

Engraved
Perforation
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Holes punched between stamps to make separating easier.
— Basic philately terms for amateurs

14
Watermark
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A pattern embedded in a paper during stamp producing process.
— Basic philately terms for amateurs

Unwatermarked
Issue Date
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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.
— Basic philately terms for amateurs

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