“Glorious Mother Country,” 2nd series: Oil refinery and derricks in the Northwest - 伟大的祖国，第二组: 炼油厂和井架在西北地区 （石油工业） $800 Dark violet brown
- Country People`s Republic of China
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Denomination
?$800Face value of a stamp, usually printed on the stamps.— Glossary
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Color
?Dark violet brownOriginal catalog color of the stamp.
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Print method
?EngravedMethod of process of imprinting designs on paper.
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Perforation
?Rough 14Holes 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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