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Source:
Colnect
Issued by:
Austria
Function:
semipostal
Date:
12/6
/
1936
Denom:
60+60g
Color:
violet blue
Design type:
Austrian inventors
Design:
Robert von Lieben
Watermark:
unwmk
Perf:
12.5
Width:
33.00
Height:
33.00
Catalog value:
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40+40g blblk d=Carl Auer von Welsbach
Next:
64+64g dkgrn d=Viktor Kaplan
External links:
Colnect 17135-..tube-Inventors
