Solved
Does anyone have an idea what supposed to be the top marking of L3G4200D?
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It may have been a custom part built to Apple specification, similar to the L3G4200D. It's shown in a couple of tear-down analysis (iPhone 4), and probably built in the 100,000's. So perhaps wouldn't surprise me if it ended up in the secondary market.
https://www.ifixit.com/Teardown/iPhone+4+Gyroscope+Teardown/3156
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