"Rasterfehler im Aetztiefdruck"(Grid plate flaws photogravure printing), Extremely interesting handbook about varieties
Extremely interesting handbook about varieties by Heinrich Kubli,
109 pages in German and French with many self-explaining photos.
This book has been written from the greatest searcher of this
area, Heinrich Kubli.
In 1936 when Swiss post begun to use stamps printed by Courvoisier SA with the then the
most modern Heliogravure (Photogravure) method, new types of regular plate flaws came up.
The most common types are called : "Bean", "Snake", Morse "N", Morse "O", "Banana" and
"Halo" - the varieties are to found exclusively on Courvoisier printed stamps
(specially during WW2, when it was impossible for Courvoisier to order new particular glass
printing-plates from Germany, that would have been necessary for flawless
printing.
As these glass plates had been used (and reused) in several positions the same plate flaws may appear
at a particular position or changed by 90° or 180°. The research of
these plate flaws is very popular in Switzerland, as they appear on mostly cheap and reachable
but very attractive stamps - they may appear in any glassine of Swiss
duplication and stock or overstock of the concerned period.
The book explains the printing method and the historic circumstances
lists and quotes all Swiss stamps concerned (1936-49).
The book contains also some stamps from Liechtenstein, Luxembourg and
Belgian Congo, that were printed also by Courvoisier in the same
period.
The flaws are quoted never hinged, used and on cover from a few to
several hundred Swiss Francs, an opportunity for
searchers to find undiscovered varieties! Who knows perhaps you have sleeping
rarities/beauties in your holdings..
This is new old stock (sealed as shown on picture #1), issued 1996.
To own a normal Swiss catalog (Zumstein or SBK would be useful but not
necessary). The catalog lists much more varieties (of this kind) as any
other catalog treating Swiss varieties.
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