I agree with Faux Pas. There’s only one medallion.
I don’t think Regina lost her memories because if she had forgotten Jefferson, then how would she have remembered the hat in the first place? I think she was just being extra careful. She doesn’t want Emma to know too much especially about someone like Jefferson. They could be very powerful against the queen. At first, I thought she forgot, but upon rewatch I decided otherwise. Initially I had thought that the curse was reversing on her and erasing her memories since she had previously been unaffected. However, I don’t think that is the case anymore.
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