The Penny Black |
The stamps were printed in sheets of 240, engraved on steel plates, on gummed paper with a single small crown watermark on each stamp. Eleven different printing plates were used during the life cycle of the Penny Black. Every penny black stamp has letters in the lower two corners. These simply identify what sheet position the stamp occupied. There were 68,158,080 penny blacks issued. The stamps were not perforated, and had to be separated using scissors or a knife. As there was only about 1mm between one stamp and another, it was very easy to stray just a little and cut into the printed design of the stamp. Some 11 plates were used to print the 1d Penny Black, producing over 68 million examples. Only two plates were made for the 2d value. There was a proposal for government versions with the letters 'V R' in the top corners but this was abandoned.
Source: http://postalheritage.org.uk/page/pennyblack
Source: http://postalheritage.org.uk/page/pennyblack
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