I thought I'd share something I've been curious about for a while. I picked up a 1839 No Drapery
Seated Liberty half dollar on a Heritage auction in 2018, graded PCGS XF40. I remember receiving it and being happy with it, but when looking at it with light shining from the side I noticed something in the area the later-added drapery would be. My first thought was it was an altered coin, but the shape of the rock to the left of liberty was correct for a no-drapery half. And, it was graded by PCGS, and I can't imagine something like that would slip by them. The cert number checks out (in fact, my purchase shows up as the last auction appearance).
Anyways, here's a pic of the half straight on, and everything looks fine:

When I zoom in a bit, and hold at an angle with light shining from the side, I see a hint of something that at first glance looks like remnants of drapery:

Lastly, here's a pic of a "with drapery" half I have, just for reference:

Any thoughts of what I'm seeing there? Just a coincidental stray mark, a die irregularity, or just my imagination? Thanks!