Australia 1964M Penny Incomplete Planchet Error

AUD$40

Coin Type:Australia Penny
Grade:aEF (Spots)
Year:1964
Mint:Royal Mint (Melbourne)
Obverse:Elizabeth II (Gillick)
Reverse:Kangaroo (George Kruger Gray)

A really interesting 1964M penny. The obverse at the bottom has had a cold shut fall away prior to being struck. When struck the missing metal on the obverse resulted in the PENNY on the reverse being weakly struck. A lovely little error of a type not often seen. A couple of spots detract.