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Old 12-05-2020, 04:50 PM   #11 (permalink)
freebeard
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It's possible that those dark smudges are from rubbing up against something and the phasing matches because the surface flexed. Or the rivet heads protected the surface. I lean toward the latter.*

That Sylph has a really clean front axle. And the 'elevator' has upswept tips.

*Like JulianEdgar speculated.

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