Question on possible lamination error

[SilverAge3]

Can anyone explain what's going on under the lifted arm? Is this some lamination or annealing issue? I'm suspecting lamination flaw.

I am having issues showing much more of the coin due to file limitation constraint.

[oldcopper]

7 hours ago, SilverAge3 said:

Can anyone explain what's going on under the lifted arm? Is this some lamination or annealing issue? I'm suspecting lamination flaw.

I am having issues showing much more of the coin due to file limitation constraint.

 

Looks like the product of a die crack. Here's a similar wiggly one on the recent P.1237 halfpenny sold DNW Oct 2023:

[SilverAge3]

Thank you

[shagreen]

If it is a die crack the opened crack would result in a raised or convex feature on the coin. The picture looks more like lamination problems with the planchet "blistering" during its production. Lamination features typically reveal missing metal in contrast to raised metal from a crack

[SilverAge3]

Thank you

[oldcopper]

On 2/25/2024 at 5:08 AM, shagreen said:

If it is a die crack the opened crack would result in a raised or convex feature on the coin. The picture looks more like lamination problems with the planchet "blistering" during its production. Lamination features typically reveal missing metal in contrast to raised metal from a crack

You may be right, but I've never really understood what is meant by the term "lamination" in terms of a coin's surface. In this case it would presumably mean partial flaking of metal from the flan on striking not caused by any irregularity in the die.

However, the P.1237 does show another similarly textured fissure on the left of the bust, stretching from the back of the King's head to the second G in Georgius. This can be seen on another example of the large crowned bust, the P.1220 lustrous copper example (lot 605, DNW Oct 2023). As this fissure is on more than one example, it has to be from a hairline die crack. Though I have not seen any other P.1237's with the complex fissuring to the right of Britannia shown in the example above.

Edited February 26, 2024 by oldcopper

[SilverAge3]

I guess another term for lamination error is delamination, though often i see people just say lamination solo, which isn't quite correct.

My original post coin had more areas than i cropped to, it was just an easy to see example spot, and trimmed the pic size down adequately for the forum. 

Edited February 26, 2024 by SilverAge3