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Teenager finds ‘holy grail’ Lego octopus from 1997 spill off Cornwall coast
(www.theguardian.com)
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How can someone tell them apart, it's not like they have serial numbers?
Probably by the degree and type of erosion, I would guess. Sellers and traders of these pieces also likely would have to keep up some level of reputability in order to remain in the market.
It's plastic, the erosion would likely be minimal if any (sadly, as that contributes to why plastic is so bad for the environment)