New Industrial Machinery: Electron accelerator - 工业新产品: 静电加速器 22f Lilac & black

Vertical

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

22f
Color
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Original catalog color of the stamp.

Lilac & black
Print method
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Method of process of imprinting designs on paper.

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

11x11 1/2, 11 1/2x11
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.
#
?
Catalog number of stamp.
— Basic philately terms for amateurs