I have a couple of seconds - of limited edition pieces.
My Helen MacDonald "Edinburgh Rock" has a few swirls in the casing if you look carefully enough - but it's not been faceted or engraved like the non-seconds.
I've also got 2 large "Free-form" chargers, one has a bit of a bulge falling down from the underside, the other I cannot fault - unless you count one tiny elongated bubble. As these are both completely unmarked, I am assuming they're seconds, given they're limited editions of 250.