Hey, Mick, I spotted this one in the other thread but I'm at my dad's for the weekend, so haven't any access to books, hence my memory recall 'only' on the crown type in the other post, but will look at that too when I get back.
re the pellets (will look out the class later), I don't believe it intentional, just a partially struck coin being re-entered into the die. It could also happen that a coin of a different monarch is used, leaving some of the remaining details visible in the fields. Equally, it could be old die stock that hasn't been properly cut back before punching in the new design (finding a matching reverse die would confirm this).
Either way, I wouldn't say it's anything significant, especially in the field of hand hammered coins. Different perhaps in the milled market.
Hope you're well? Will come back to the class early next week, unless someone gets in before me!