This is one of my most interesting die crack coins , A piece of the penny almost the size of the Exergue is about to break away, leaving the line of the border teeth disjointed, and the second 2 enlarged. Terry
Lamination has been a problen as long as plate has been rolled. Pockets of air can get trapped leading to effects such as this brass 3d. The coin was held together at the periphery only, with the dark areas showing where the trapped air has oxidised the inner surface.
OK, a starter for 10. The 1824 bare head halfcrown obverse die must have been close to disintegration when this was struck. The flaws radiate from the centre in all directions and are noticeably worse than on other 1824s I have seen.
Yes, I have tried to be diplomatic but definitely "caveat emptor". I many years ago got a very nice pattern model 1927 shilling for a quite decent price and got a couple of off metal strikes for a song. I still look but haven't been back since Laurie passed. Really just trying to alert our loyal forum members, if they needed it....