I think it most resembles die cracks except for the line inside the "4". It possibly was made by the punch that was used. I'm just shooting in the dark here, someone else may have a better answer.
This is WB-102. It's considered a 48/47 overdate - look for the 7 in the upper loop of the 8. Two reverses are paired with this obverse; one usually has peripheral die cracks and the other has noticeable lumps under the vertical stripes in the shield. Pretty scarce variety, but little demand as few collect these by variety.
Seated halves are among the most comprehensively-documented issues for variety, if you know where to look:
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