Map of Ireland 6p blue gray & deep green

Souvenir sheet of 4

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

6p
Color
?
Original catalog color of the stamp.

blue gray & deep green
Print method
?
Method of process of imprinting designs on paper.

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

15
Watermark
?
A pattern embedded in a paper during stamp producing process.
— Basic philately terms for amateurs

unwatermarked
Issue Date
?
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