Farthing Specialists Needed!

Hello all, I was wondering if you could help me with this interesting farthing. It is dated 1840 and it has a few unusual features. The first trident is shorter then normal, with this date obviously having the scarce two prong trident variety, and it has clashed die attributes that are the same in the 1840 2 prong variety. They are weaker then the examples I have seen previously but are in the same positions as is a key feature with the 2 prong trident. I have had a 1840 2 prong before and the prong was even shorter i.e non existent but I have seen other examples with varying lengths. I also note that the 1839 2 prong variety in the Colin Cooke collection had a prong similar to the length of this but being a different year it may have different attributes. In the opinion of the experts on here would you say this is possibly a 'mid point' variety between a normal specimen and the two prong trident? Any opinions or information would be greatly appreciated. Thanks all, Jack.