I found those marks with a crappy loupe that I had but to that device it was a little shimmer. So I kept them and waited until I can get a better device to observe those anomalies. When I bought the usb camera a month later it was fascinating to find that. I'm no expert but others were saying that it wasn't worth attributing so I left it at that. I'm always searching for that WOW factor in a coin. Though to me that little icicle in the doorway was my biggest find so far but I've been off and on searching little by little. Hopefully I will find more. I liked those circle ones you have.
I keep going back to the same Bank of America hoping to find more and so far I've found some interesting finds. Today I bought more nickels one roll stood out from the rest with "BUFF" lettering and different color roll. It was a whole roll of
Buffalo nickels and I just posted it recently. I know nothing about them.