Has the seat tube been crushed by a front mech clamp?
No - it's paint damage but the seat tube is tapered (squared off?) below where the clamp sits. It confused me when I first saw it, but it's meant to be like that.
You can sort of see it in this picture - the reflection changes on the taper.
@bjf started
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Has the seat tube been crushed by a front mech clamp?