This appears on opposing sides (obv and rev left side as you view it), how do I call it for my notes and what caused it?
I believe it was in a bezel worn as a necklace. The nicks around the rim looks like it was worn as jewelry.
Yes a lot of time when a jeweler is mounting a coin if not in a solid bezel, they will do 4 wrap arounds the coin at the 4 locations of 10 & 2 8 & 4 much easier to mount and keep secure.
Collar clash can't affect both dies because the anvil die is enclosed within the collar so it can't clash against it.