The same horizontal lines ... apparently proud (raised) of the surface based on your photo ... can also be seen to the left side of the obverse portrait - not just 'behind his face' as you suggested.
Being mindful that the raised elements of our coins (portraits and legends) are in fact actually incuse (sunken) on the die that strikes them ...
Then it follows (perhaps) that the proud horizontal lines must have occurred on the original planchet prior to being struck as I see no evidence that they continue across the obverse portrait.
From there I am beyond my personal expertise to explain this - it would seem that any die strike would obliterate original all original planchet marks.
Nice find - I believe it is indeed an error coin ... and appreciate you sharing it with us.
Quote: Then it follows (perhaps) that the proud horizontal lines must have occurred on the original planchet prior to being struck as I see no evidence that they continue across the obverse portrait.
If the lines had been on the planchet pre-strike the contact of the fields of the die (highest part of the die) would have flattened the lines before they would have been flattened in the portrait. So pre-strike lines/marks on the planchet, such as adjustment marks or roller striations, are more likely to survive in the designs than on the fields. Also since the die faces are slightly convex lines in the fields are more likely to survive out toward the edges of the coin than close to the center.
I'm always impressed by how quickly you guys and gals identify these errors. It's like you have the forum hardwired to your brain. Do you ever get stumped?
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