Windmill, Retz 4.50s Bright green & blue green

Size: 23x29mm

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

4.50s
Color
?
Original catalog color of the stamp.

Bright green & blue green
Print method
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Method of process of imprinting designs on paper.

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

13 1/2x14
Watermark
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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