Dr. Sun Yatsen, Surcharged in Black - 黑色印的孙逸仙博士 20c on 17c Olive

m20 (m - Honan)

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

20c on 17c
Color
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Original catalog color of the stamp.

Olive
Print method
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Method of process of imprinting designs on paper.

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

12
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