What would have done this ?

[accumulator]

http://www.ebay.com.au/itm/1914H-AUSTRALIAN-HALFPENNY-ERROR-COIN-/170962131593?pt=AU_Coins2&hash=item27ce231a89&_uhb=1#ht_500wt_1288

Looks like some sort of cutting tool handy work at first,then when you blow it up i'm scratching my head at this.

[Goldseeker]

I believe they call that kind of indent a a "cold shunt".

Its where a pice of metal is folded over the surface and then falls off as a result of the minting process.   its like when your mum tries to roll a bit of pastry onto another piece and it falls off as it does not stick to the rest of it.

I have several examples of this in my error coin album.

[Sapyx]

I'd call it "hacked at with a pair of tin-snips". Or perhaps it was caught in some kind of machine. I don't see any evidence that it is anything other than post-mint damage.

[trout]

I'd call it "hacked at with a pair of tin-snips". Or perhaps it was caught in some kind of machine. I don't see any evidence that it is anything other than post-mint damage.

I agree PMD for sure:dodgy:

[enworb]

What a dumb......

[Goldseeker]

If the damage was done with a pair of tin snips, why is the "cut" only partially through from one side to the other.

If tin snips had been used, then surely the cut would be completely through the majority of the cut.

However, lets not lose any sleep over it.

[robbiegal]

Looks like damage to me - the coin is damaged both sides with no blakesley effect considering the rather large apparent failure on the rim. Usually I'd expect any planchet layers that were extras to only affect the one side as well. If it were die bubble it wouldn't be matched quite so well on the identical side?

[enworb]

I dont think theres any doubt this is PMD. PMD is PMD to me.