When blue is blue

Scientific treatise and study on the composition of the paint on the Protectorate 5h blue linden leaf stamp. Study of the dependence of the amount of paint on the color shade of postage stamps.

03. 05. 2025
Complete description

Commemorative Postmark:
60 years of the Slovak Technical Museum in Košice

60 years of the Slovak Technical Museum in Košice
Day of use: 28. 04. 2007
 
Post office: KOŠICE 1
Colour: black

Angličtina / English

Use translation by Google Translate (no guarantee).

Príležitostná ručná pečiatka používaná pri príležitosti 60 rokov Slovenského technického múzea v Košiciach.




Autor: neuvedený


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