Mint plate number coils are usually collected in strips of five, so you have instantly gone from having a complete collection of about 60 face-different stamps to a collection requiring thousands of stamps, ...
PNC3 Catalog of Plate Number Coils
At the beginning of 2003, PNC3 began publishing its own catalog of Plate Number Coils. The project is designed to be complete in stages.
As with many aspects of stamp collecting, only you can determine the "right" way to collect plate number coils - right for you. One common approach is to seek an example of every known plate number in a mint strip of three or five.
Rare PNCs (Plate Number Coils) used on cover, an early use stamp that slipped out of a post office, perhaps some clever advertising covers.
In some cases, for instance the Penny Reds of Great Britain and modern United States plate number coils, the plate numbers appear in the stamps themselves, but the more common practice is to include the number in the margin of each sheet, ...
(Earlier stamps had plate numbers which were trimmed off.) Collectors eagerly hunt for Plate Number Coils and save them in symmetrical strips of 3 (PNC3) or 5 (PNC5) with the stamp bearing the plate number centered in the strip.
 See also: Coils, Used, Stamp, Plate, Plate number
  
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