It looks like the masking tape used for the killstripes pulled off some paint off the dome, and they fixed it painting over it with the same green as used on the dome.
ESB:
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PP3
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So you could either mimick that on your helmet by scratching away some paint to reveal the silver layer, or paint a “tape pull” with silver and then paint over that with your dome green, thinned down to be translucent. That’s what I did and I’m quite pleased with it.