Plane, Train and Ship, Surcharged with Gold Yuan in black - 飞机，火车和船舶，套印的黑金元 50c on $20 Red brown

Without Gum; Type I;

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

50c on $20
Color
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Original catalog color of the stamp.

Red brown
Print method
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Method of process of imprinting designs on paper.

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

12 1/2, 13, 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