Rare Penny Black Block of 12 Expected to Fetch Up to £200,000 at Auction
The Penny Black holds a singular place in philatelic history as the world's first adhesive postage stamp, and any significant example of this iconic issue tends to attract enormous interest from collectors worldwide.
This month a particularly extraordinary piece comes to market: a block of 12 unused Penny Blacks, described as one of the largest such blocks still in private hands, with an auction estimate of £150,000 to £200,000.
The story behind these stamps is as fascinating as their rarity. During renovations at the Dublin General Post Office in 1905, builders knocked down a wall and discovered a hidden cupboard behind it. Inside was a cache of approximately 175 Penny Black stamps that had apparently remained untouched since 1840, the year they were first issued. Over the subsequent decades, this remarkable find was gradually broken up and dispersed among various collections. However, one section, a block of 12 stamps, survived intact and has passed through relatively few hands in the 120 years since its discovery.
According to Mike Hall of JC Auctions, the block is notable not merely for its size but for the exceptional quality of the stamps themselves. Hall described the preservation as being remarkably close to original condition, which is virtually unheard of for a block of this size. He also noted that these particular stamps display an unusually deep and rich colour, a characteristic that experienced Penny Black collectors prize very highly. Not all Penny Blacks are equal in terms of print quality, and the depth of impression can vary considerably depending on which printing plate was used and at what stage of that plate's working life the stamps were produced.
A Brief History of the Penny Black
To appreciate why a block of 12 small stamps could command such a price, it helps to understand the historical significance of the Penny Black and what makes certain examples so much more desirable than others.
Before 1840, the British postal system was expensive, complicated and widely regarded as inefficient. The cost of sending a letter was determined by the distance it had to travel and the number of sheets of paper it contained, and crucially, postage was normally paid by the recipient rather than the sender. This meant that many letters were simply refused on delivery, costing the Post Office both revenue and goodwill. The system was also riddled with exemptions and abuses, including the widespread practice of "free franking" by Members of Parliament.
The reformer Sir Rowland Hill proposed a radical overhaul of the system in his 1837 pamphlet, Post Office Reform: Its Importance and Practicability. Hill's central insight was that the actual cost of transporting a letter was negligible compared with the administrative costs of calculating and collecting variable postage rates. He argued that a single uniform rate of one penny, prepaid by the sender, would dramatically simplify the system and increase the volume of mail to such an extent that any initial loss of revenue would quickly be recovered.
Hill's proposals met with considerable opposition from those who benefited from the existing arrangements, but they also attracted powerful support from merchants and traders who saw high postal costs as an obstacle to commerce. After a parliamentary inquiry, Hill was given a two-year contract to implement his reforms. A competition to design the prepaid stamps attracted some 2,600 entries, though none was ultimately deemed suitable. Instead, a design featuring a profile portrait of the young Queen Victoria, based on an 1834 medal by William Wyon, was selected. The portrait was chosen partly because Hill believed it would be difficult to forge convincingly.
The Penny Black went on sale on 6 May 1840, though some post offices, including those in Bath, began selling stamps a few days earlier. The stamps were printed by Perkins Bacon in sheets of 240, arranged in 20 rows of 12 columns, with each stamp bearing corner letters identifying its position on the sheet. They were imperforate, meaning they had to be cut apart by hand.
The effect on postal volumes was immediate and dramatic. In the first year of issue alone, the number of letters sent in Britain more than doubled, rising from around 76 million to over 169 million. The Penny Black remained in use for less than a year, however. The red cancellation ink used to mark stamps as used was difficult to see against the black background and relatively easy to remove, which meant unscrupulous individuals could re-use cancelled stamps. In February 1841, the Treasury replaced the Penny Black with the Penny Red and switched to black cancellation ink, which proved far more effective.
What Makes Penny Blacks Valuable?
Given that nearly 69 million Penny Blacks were printed during their short period of use, it might seem surprising that any of them could be worth significant sums. Indeed, as we often explain to people who contact us here at Tony Lester Auctions, individual used Penny Blacks in average condition typically sell for somewhere between £10 and £80, depending on factors such as the size of the margins and the overall state of preservation.
However, several factors can push the value of a Penny Black far beyond these modest figures. Condition is paramount. Because the stamps were imperforate, the quality of the margins, the space around the printed design where the stamps were cut apart, varies enormously. A stamp with four clear, wide margins is worth substantially more than one that has been cut into the design. Colour intensity also matters greatly, as impressions from fresh, well-inked plates are far more desirable than pale or worn examples.
The printing plate used is another significant consideration. The Penny Black was printed from 11 different plates, and examples from Plate 11 are notably scarcer than those from other plates, as this plate was only briefly used before the switch to the Penny Red. Plate 11 Penny Blacks can be worth thousands of pounds even as single used stamps.
Unused examples are considerably rarer and more valuable than used ones, since the vast majority of Penny Blacks were, of course, actually used for their intended purpose of sending letters. And blocks, where two or more stamps remain joined together as they were on the original sheet, are rarer still. Most stamps were separated before use, and those that survived in multiples have often been broken apart over the years to maximise individual sale values. A block of 12 unused Penny Blacks in outstanding condition is therefore an extraordinarily unusual survival.
Why Stories Like This Matter for Collectors
News stories about stamps selling for hundreds of thousands of pounds can sometimes create unrealistic expectations. We regularly speak with people who assume that any old stamp must be valuable, or that a childhood collection assembled decades ago might be worth a fortune. The reality, as we always try to explain honestly, is that the overwhelming majority of stamp collections have relatively modest values, and age alone is no guarantee of worth. What matters is the quality, rarity and desirability of the individual items within a collection.
That said, stories like the Dublin Penny Black discovery serve as a wonderful reminder of why stamp collecting continues to captivate people around the world. There is something genuinely thrilling about the idea that a hidden cupboard in a post office could conceal stamps worth a small fortune, or that a block of tiny pieces of paper, each with an original face value of just one penny, could be worth more than most houses nearly two centuries later.
For those of us in the philatelic trade, these stories also underscore the importance of proper valuation. If you have a stamp collection, whether inherited or built up over many years, it is always worth having it looked at by an experienced professional before making any decisions about selling. What appears unremarkable to the untrained eye can occasionally turn out to be far more significant than expected, and equally, items that look impressive to a non-specialist may prove to be relatively common.
At Tony Lester Auctions, we are always happy to provide valuations of stamp collections of all sizes. If you have stamps you are considering selling, please do not hesitate to get in touch by calling us on 01926 634 809 or by completing the valuations form on our website.
