Double Strike Valuation (possible triple)

I have quite a few double striked 5c coins, all varying in the strike error (some ¼, some ½) but this is the most prominent.

An approximation of value is appreciated. 

Edit: I just noticed the Echidna's forehead and “5”, this is not a defect, just PMD

Edit #2: Upon closer inspection, this could be triple struck?

• Added a higher quality image on a higher light spectrum.