I have an 1822 2 Skilling Species from Norway that has split in two but in the strangest of ways. One half overlaps onto the other so when put together, the two halves meet up perfectly. This coin has been in a box for at least the past 50 years with some other foreign coins my dad had. If you look closely, the right side of the coin also has a crack but that crack did not go all the way through and separate. Any ideas as to what kind of error this could be? The fact that the two halves are still together after almost 200 years is pretty amazing to me. Any help would be appreciated. Thanks