Lamination Flaw Coin Error: I like to think of this error as one where the thin layer of on top of the impurity metal from the coin has not really detached from the coin.
lamination flaw See delamination large cent - A U.S. coin with a value of 1 cent, minted from 1793 to 1857, composed primarily of copper and larger in diameter than the current U.S. quarter ...
G2526 2729 Attika, Athens: AR 24 Tetradrachm
$850.00
Obv. -- Helmeted hd. of Athena r.
Rev. Owl stg. r. in incuse sq.
17.16 g
Sear G2526: SNGC 31ff
sm. lamination flaw on owl's wing, oth. nice sharp aEF ...
Additionally on this example there is a lamination flaw at the ON. Possibly the line running from the first stroke of that N to the bust is another die crack rather than part of the lamination flaw.
A coinage defect consisting of a portion of the metal separating from the rest due to impurities or internal stresses. Lamination flaws occur primarily when a foreign material or gas oxide becomes trapped within a die.
Fully struck with hardly a mark. The coin is a beautiful russet-toned example. The clash is strong and plainly visible. The only reason this is not a higher grade is a planchet lamination flaw under the neck of the Eagle. It is a MS64 otherwise.
 See also: Coin, Lamination, Collector, Reverse, Strike
  
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