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1881 IHC error or anomaly? Opinions appreciated

I am trying to grasp the possibilities of this 1881 IHC with an interesting raised metal blob between the U and the 1 of the date. It is raised and not incuse so it is not struck thru. Any ideas? Maybe a damaged die? I am 100% sure it is raised metal! That is the extent of my analysis! The coin is graded NGC MS64BN. I'd appreciate some other thoughts on it.
2
Comments
Die chip, interesting and near the date so it shows up well.
bob
Maybe a trapped gas bubble?
Interesting
Die gouge.
It’s not in Rick Snow’s book nor Poloquin’s (sp) research. If it is a die gouge which I suspected it was, maybe I should send it to Rick for attribution? What do you IHC guy’s think?
We used to call this an “occluded gas bubble’ ( back in the 60’s/70’s)
If it pops, it’s a nice lamination
Thank you! Case closed.
…….MarkKelly called it first. Good catch.
I have a Lincoln Cent, 1947, with the occluded gas bubble above the date.