If the two rev. dies are different, then it would be a "Kraay" overstrike, where those two rev. dies were being applied alternately at the same obv. die, and a finished coin was not removed fast enough, so was mistakenly overstruck with the second rev. die.
Very interesting! I do believe the
reverse it a die match however, they seem to aline perfectly.
Unless I'm mistaken the obverse appears to be similarly over struck, albeit by the obverse die, with the same rotational component as the reverse, suggesting the coin remained on the anvil after the initial strike, but rotated on the anvil before being struck again.
Yes, I agree. I believe you can see the remnants of the crest in front of Athena's
face and remnants of the neck on top of her
head. If the coin mistakenly remained in the anvil after the first strike, wouldn't we expect another
flan to have been placed on top resulting in a flattened
owl?