Best side-glow fibre optic I've seen

Given that these came from a pound shop (UK dollar store) I wasn't expecting too much, even if they did cost a bit more than a pound. But when I tried one out it had the linear consistency of electroluminescent wire, but with an LED source.
The resistor on the PCB is strange. Almost like a design error, unless it's intended as some sort of fuse if the chip fails. It really feels like it was supposed to limit the LED current.
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