Under German Occupation: German Stamp 2fr50c on 2m Gray blue

Surcharged

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

2fr50c on 2m
Color
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Original catalog color of the stamp.

Gray blue
Print method
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Method of process of imprinting designs on paper.

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

14, 14 1/2
Watermark
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A pattern embedded in a paper during stamp producing process.
— Basic philately terms for amateurs

Lozenges
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