lamination?

[andrea78ts]

Any idea about what kinf of error is this?
There is a low area normally struck...lamination?

[diamond]

You've got a stepped (bi-level) die crack that extends between two points on the rim. The portion of the die demarcated by the crack protruded slightly beyond the plane of the die face. Alternatively, the portion of the die face that lay outside the crack retreated slightly. You don't see this pattern of brittle failure very often, except on Indian coins.

[andrea78ts]

Thank you!
Is it a sort of "opposite retained cud" of the hammer die (the crack is on the observe side)?
If I have correctly understood, the fragment of the cracked die went up (compared to the surface of the die) instead of going down (as usual in a retained cud). In case of hammer die, due to force of gravity, I deem it should be usual that the fragment goes up (compared to the surface of the die). Isn't it?

[diamond]

Yes, its appearance is the opposite of a retained cud. Here we have a step-down on the surface of the coin, rather than the step-up commonly associated with a retained marginal die break (retained cud). It's important to understand that retained cuds of the hammer die don't really exist:

http://www.coinworld.com/articles/me...uds-questioned

What we have is brittle failure occuring within a still-intact die, brittle failure that results in a sinking-in on on side of a die crack.