i came across this coin in ebay and was wondering if it shows signs that this was placed in a holder with pvc



i've never seen toning like this on any of my coins before and im hoping someone here has any knowledge on this. thanks in advance!

it's probably submerged in a river or lake then got covered in algae over time.


i have something similar, except that my coin had corrosion because it was submerged in sea water (taken from a shipwreck). but we have the same tone (green, brown, with a bit of it going to black)