135th anniversary of the birth of Friedrich Engels (1820-1895), German socialist: Engels - 弗里德里希·恩格斯诞生一三五周年纪念（1820-1895），德国社会主义者：弗里德里希·恩格斯 20f Brown

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

20f
Color
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Original catalog color of the stamp.

Brown
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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