For The International Bureau of Education: Reservoir, Grimsel 20c Brown carmine

Overprint 18mm wide

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

20c
Color
?
Original catalog color of the stamp.

Brown carmine
Print method
?
Method of process of imprinting designs on paper.

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

12x11 1/2
Watermark
?
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