Australian 1c Coin With Unusual Error

It appears to have been hit with a curved object roughly 2mm in thickness, perhaps 100 mm or so in diameter.


The raised dot on the reverse seems to be the impression left by die damage at that point.
Another raised dot on the rim next to it, not circular, perhaps a die chip.

There is also another raised dot above the 'B' in 'ELIZABETH'.

Perhaps the explanation for the raised dots is that some small particle debris had found a way between the dies.