Thank you for your inputs, appreciated it and guided to me a conclusion. I have acetone bathed it for a day so it's not a glue or anything similar. What was throwing me was the cracks complimenting the damage, however laminate errors are in straight lines and a clad layer error would make it weigh less.
My conclusion is this coin suffers from post-mint environmental acid corrosion that has deeply eaten into the copper-nickel alloy, leaving behind green verdigris crust and corrosion, revealing the under-surface alloy, which has induced stress corrosion cracking (SCC). All of which is
PMD.

