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

Postal Card with imprint:
Exhibition the World of Stamps

Exhibition the World of Stamps
Date of Issue: 10. 03. 2017
 

Angličtina / English

Use translation by Google Translate (no guarantee).

Postal (correspondence) pre-stamped card with embossed stamp Historical postal motif - Post Horn with the imprint for the Exhibition the World of Stamp.




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