1941 d nickel

reverse of coin, is this considered a die crack error? thanks

 

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Its called a lamination error

 

thank you!

 

Yes to Lamination which is common on those older Nickels.
A Die Crack is on the Die itself so when a blank Planchet is struck the area would look raised on the coin because the metal of the Planchet is flowing into the crack.
For example -

 

thank you!