CONDEFERATION HELVETIA
1957
![](https://s8.postimg.cc/4bl8tn3p1/Switzerland_Flag.jpg)
Universal Postal Union Issue
UPU Monument
Forty Centimes Blue
White Granite Unwtmk Paper
Perforated 11.5 x 11.5
Engraved Printing
Hélio Courvoisier S.A., La Chaux-de-Fonds
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Scott 2022 Catalogue Switzerland 9O6 ( CV $ 2.75* / 2.75 US )
Michel Katalog Schweiz Mi
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SWITZERLAND 1918-2010 European Offices UPU
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The PERFORATIONS NETWORK
OTTAWA CANADA