Stamp Arrangement and Location
The stamps are arranged on the sheet in a table with rows and columns. Due to this arrangement, the location of each stamp can be precisely determined. The philatelist counts the single stamps horizontally from left to right, but the post counts them vertically from top to bottom. Accordingly, the third stamp in the sixth row of a sheet of 10 x 10 would be the 53rd stamp of the sheet for the collector, but the 26th stamp for the post.
The first postage stamps of the UK, the Penny Black, were printed in sheets of 20 rows and 12 columns, but the location on the sheet was indicated by different letters in the bottom corners of each stamp. An "A" in the lower left corner indicated the first row, a "B" the second one, the "C" the third one, etc. The columns were indicated according to the same scheme in the lower right corner. Thus the top left stamp had the letter combination "A" - "A", the bottom right stamp had "T" - "L". As a result, 240 different stamps were made for each plate used. This was intended to prevent forgery.
Read more about this topic: Sheet Of Stamps
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