I'm on team lamination.
Notice how the separation between the layers diminishes as you move towards TRUST? If that were a
Rim Fin that somehow got folded over you wouldn't expect to see that because the entire area of disturbance would be essentially a flap of copper folded over.
Instead, the layers of copper separated going from TRUST down to the date with separation widening as you move south.
Also, you wouldn't expect a folded over flap of copper to adhere so tightly to the rim.
Finally, the area next to the 3 can't be a second fin folded over because there's separation between it and the rim.