14/12/2025
I am working through a huge collection and have come across a Plate 20 SJ, which includes the only known 'triple corner letter', which is now in my store.
https://www.ebay.co.uk/itm/336343639198
About the Corner Letters
Corner letters were hand-punched into the plates. There was significant variation in the exact positions and shapes of the corner letters from plate to plate – something that has turned out to be extremely helpful to collectors wishing to identify the plate a stamp was printed from.
The purpose of the corner letters, and exactly how they were intended to deter counterfeiting, is still subject to debate.
A satisfactory suggestion may be the expectation that counterfeiters would not create entire plates, but instead just one stamp, with one set of corner letters that would be replicated. If postal workers observed a particular combination occurring with unexplained frequency, steps could be taken to double check the authenticity of that stamp, and efforts undertaken to trace the source.
Later stamps, with letters in all four corners and the bottom letters mirrored at the top, benefitted from the anti-fraud feature that it was harder to convincingly join two clean halves of used stamps without the letters mis-matching. But that was not the case for the earlier stamps with only two letters – and so the first explanation may be more likely.
Although there was huge concern around fraud and counterfeiting of stamps from 1840 onwards, the only known major forgery perpetrated against the Victorian Post Office was the infamous Stock Exchange forgery of 1872/73. This involved the counterfeiting of thousands of One Shilling stamps and their application to telegraph forms at the London Stock Exchange.
Although there are isolated examples of fraudulent re-use, there is no evidence of any major fraud related to the imperforate Penny Reds.
About Double and Triple Corner Letters
When hand punching the corner letters into the plate, sometimes the worker would misplace and then adjust the position of the punch, creating a doubled letter image. These letters not only assist greatly with plating but are a particularly collectable variety.
There is also a documented example of a triple letter. On item Plate 20 SJ, the first letter S was misplaced low in the corner square and was only partially erased. A second attempt, or possibly a rebound strike, can also be seen to the left of the final strike.