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:
40 years of the NITRAFILA philatelists` club in Nitra

40 years of the NITRAFILA philatelists` club in Nitra
Day of use: 07. 06. 2022
 
Post office: NITRA 3
Colour: black

Angličtina / English

Use translation by Google Translate (no guarantee).

Commemorative postmark used in Nitra on the occasion of the 40th anniversary of the NITRAFILA Philatelic Club in Nitra.


Text motifs: 40 ROKOV KLUBU FILATELELISTOV / 1981 - 2021 / NITRAFILA (logotyp)

Pictorial motifs: Logo NITRAFILA - prasknutý hlinený džbán z archeologických nálezov v zúbkovanej známke.

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