It took a few weeks to start seeing 2025 nickels in circulation This Nickel has what looks like a bubble through the reverse on Monticello, I don't know what's going on other than pre laminatition?
Looks like it may be what the error experts here call a linear plating blister. From @paddyman98: Plating Blisters
Well, it's not a Die Clash, Break or Crack, nor Lamination. And I highly doubt it's Post Mint Damage. Nickels aren't plated, so it isn't a plating blister either. Like @Jersey magic man said, something must have scraped across the die. https://www.error-ref.com/die-gouges/ https://www.error-ref.com/die-scrapes/
I'm in the die gouge camp. It wasn't deep enough to impact Monticello, which appear to be struck normally. Something to look for, if I ever get any 2025 coins...
Looks to me to be minted by a die that had some minor damage. The metal was forced into the space and appears raised on the coin. Nice find!