Very Rare Error 1946 SA Union 1/4 penny coin with an "Extreme Pressure Error" - SANGS Graded

Very Rare Error 1946 SA Union 1/4 penny coin with an "Extreme Pressure Error" - SANGS Graded        

Rare error, this is the only example that I have seen.

It dose look like an extreme pressure strike; the design around the edge is almost 'smeared' but in the centre it is basically perfect, just like in a broadstrike error, but the coin is the exact same size as a normal 1/4 penny coin. Furthermore, the rim protrudes a lot higher on both sides than in a normal coin.