The upset mill puts a rim on the coin before it's struck, and there's a rim on the die as part of the design, so when a planchet is struck with a misaligned die that second die based rim shows up, misaligned with the already present rim, which is what you're seeing here, rather than a Rim Fin.
On the reverse at K9 you can see the effects of the misalignment as well.
Since the reverse shows a weaker second rim you may also have a slightly tilted die.
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