It looks like it. I can't imagine what it was, though. But it jarred that side of the rim, too, when the metal spread out into it.
Neat. Struck through cloth. About 60% Very rare error. Some information https://www.error-ref.com/struck-through-miscellaneous-foreign-matter-cloth/
@dlts Even though it is struck through cloth. It will still weigh the same as a normal struck Cent. Here is a CoinWorld article https://www.coinworld.com/news/us-coins/cloth-a-familiar-cause-of-interesting-struck-.html
You're very welcome. That find is extraordinary. It has a great premium also. Hundreds if you would decide to sell.
@dlts Here's another great article! https://minterrornews.com/features-4-29-21-struck-thru-cloth-error-coins.html I responded to your message.