Because of the results, it is actually a tilted die with overpressure strike, where downward pressure on the left side of the coin caused the upward AND downward pressures upon the collar. This also formed the smaller rim and weaker appearance on the right side of the coin(obverse and reverse)
Fins are usually formed from tilted dies. The tilt allows a gap near the collar. This raises above the rim. Then flattening in rolling or during circulation.
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