The Schnakenburg plant in Riga used two different plates for printing
the map stamps. The second plate went into use after the first plate
became worn, and corrected some flaws that developed in the first
plate. The plate number appears in Roman numeral form under the 9th
stamp in the bottom row.
Q18 Kupischki, block of 4 showing plate I. Roman numeral I slants slightly
to the right; the red dot directly beneath the numeral is part of the
O18 Kławany, block of 3x2 showing plate II. Roman numeral II slants
slightly to the left; the red dot slightly to the right beneath the
numeral [partly obliterated by perf holes in this example] is part of the plate number.
Printing plate arrangement and flaws
Both printing plates had 12 rows of 19 stamps and were formed by successive
uses of a transfer stone with 5x5 clichés. The first 10 rows
of each plate have the same arrangement of transfer stone clichés.
The last 2 rows on each plate differ from each other.
Some plate flaws in the 5x5 transfer stone appear in plate I and plate
II stamps. Some are unique to plate I or plate II.
For an excellent description of the printing stone formats and plate flaws, see
Lettland (Latvia) Handbuch Philatelie und Postgeschichte (Handbook
of Philately and Postal History), Die Briefmarken in Rubel-Währung
1918-1922 (The Stamps, Ruble Period 1919-1922) [Harry v. Hofmann
Verlag, Hamburg, Germany, 1998, ISBN 3 7636 5071 7 <6800>, pp.26-41], bi-lingual in German and English.
References before this one incorrectly reported that both printing
stones had the same format. N. Jakimovs  corrected
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Created 2001-03-26; updated
Copyright ©2001 to 2010, Bill Apsit