Some new evidence of forgery is appearing on several fronts. Click here for summaries.
I think the plates were made by pressing images into clay, then casting copper or lead. I think this portion is an impression of an Alexander coin.
Here’s the plate
Here’s the head on the right:
Here’s an Alexander coin:
I think it’s pretty clear that an Alexander-type coin was pressed into clay, then someone pushed the clay to remove the outer rim of the coin, then made the plate from the clay mold.