"Shitajikis", also called "Pencil Boards" in some countries, are big Plastic Cards of 25,70 cm x 18,10 cm.
There are different manufacturers: Movic, Amada...
This Shitajiki will be to explain:
In blue you have the manufacturer (movic here)
In red the manufacturer's
card number
For nomenclature of the cards, you have to check a number written by 4 numbers
followed by a letter.
The 2 first number correspond to the month, the 2 after to the year, and
the letter the number of the card in the collection.
For exemple: 1000A is the first card of the set from october 2000.