As stated broken or damaged lettering is very common, especially in the the first years of the bronze series on farthings, but that being said, it still can help to identify repetitive flaws, and die combinations, so I would definitely be interested in seeing some images. The Obverse E that you make refernce to is a good example, there are no dies showing progressive stages of wear that got to that point, but I have seen about 5 examples that all have the same serifs missing, and the top bar of the E broken, it's as if the die faults appeared over a very short period, or a very poor quality die was utilised. Similar examples occur for 1862 & 1865 whereby the legend reads RFG due to the flaws. If nothing else, I can keep record of it so that if any others show up the picture becomes clearer