1970S Proof Triple Dime??

Regardless of the die chip, neither coin are doubled dies. More than likely, produced with the same obv die on the same machine since once machine doubling starts, it does not stop until the machine is attended to.

Remember two things with regard to proof coins:

1. Proof Strikes are higher tonnage strikes which in turn produced more stress on the press.
2. Proof planchets receive at least two strikes, sometimes more, to bring up the full relief of the coin.

Lots of different proof coins have machine doubling.

Two answer another question which was asked:

Yes, it is possible to have an authentic doubled die which has machine doubling. Mainly because the die doubling is from the die while the machine doubling if from the press.

When this occurs, it makes attribution difficult and usually requires in hand attribution BUT an authentic doubled die is unmistakeable.

 

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I actually have a thread posted on another forum, where I posted a coin that has a DDR and MD on the same coin. I agree it an be quite tricky, but when you collect for a while, you will learn the subtle differences between a true doubled die and machine doubling/die deterioration doubling.
Anyways, here is the thread: http://lincolncentresource.net/forums/showthread.php?t=24950