First war nickel! CRH!

[beasy324]

Found my first war nickel pretty stoaked. Also 2 1939 not bad for my first nickel hunt. Also I found what looks to be some error coins can anybody tell me if I'm spotting these right

 

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[enamel7]

Sorry, but appears to be machine doubling or die deterioration.

 

[beasy324]

Sorry forgot to mention its four different coins.

 

[enamel7]

Same answer.

 

[beasy324]

Alright what should I look for or how will I know if it is a double die?