I don't pretend to know, but I wonder if the half penny was the toss away coin no one cared about which made it more rare on a similar mintage.
- like, you know how sometimes you will see a 5c piece on the ground but you wouldn't be bothered picking it up, or if you're cleaning out a desk drawer and you have a random 5c piece it's often easier to throw it in the trash.
Just a theory, probably wrong.



















