the 10sen shown is from plate 1, position 13 ... it is unique in unused state ... only a faint mark appears in the SE corner on the perfs.
plating has proven to be a hard task as cancels were applied both randomly and in bar sequence. e.g. JJJ JNJ NJN ...
ROMAN letter designs also are 2 types, rarer is indented.
normally, MAEDA sheets bear 9 black cancels : roman-letter or FM obliterators in combination1 ... this group I term an MXC - or, cancel matrix ... cross-comparison of the value plates, and redrawn plates for each value ... a sharing of the same MXC is evidenced* ...
6 MXCs have been defined and coded ... e.g. NJJ-JNJ-NJN ( where N = Nagasaki , J = Jokohama)
packet singles can be coded using roman letters. then match to plates ... using index.
.. using dbase one can code cancels to assist plating.
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