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Hi Shelly. Sorry, but no large value. It is a result of a die beginning to break up shortly before it dies. Given enough time, every die would show this feature (or something else related to the wear process) as it is due to a chip breaking off, which leaves a depression in the die surface where it shouldn't be and results in a raised lump. You might get something on ebay for it, but don't plan for a night out on the proceeds! List it for more than the cost of a second class letter stamp plus 5p and you will have a profit, as there is a collector for everything. In numismatic terms it is called a cud. FYI, another die fault arising from their destruction includes cracking prior to complete failure (leaving a raised irregular line or lines). The pictures help to explain what I mean. The second also shows a depression in the reverse field due to the flan having a fault too - usually due to bad metal mixing or a trapped air pocket. Raised will be on the die and recessed (incuse) due to the flan. Faults have many varieties and can make an interesting collection in their own right. If you are interested and want to pursue something along these lines, ask questions and search through past threads. It is fun (honestly).  Edited to add that the weakness in REX on the obverse is likely due to the compromised integrity of the reverse die, as the die axis is inverted and so follows the line of the reverse flaw. Weak or missing letters is another error rabbit hole to look into.