Cracked paint or seatpost shaft?
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Image: https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/714x785/20190221_172251_hdr_9cb3f18fab743618e2f75c3772f03b58675cc2ce.jpg
I was cleaning the bike and noticed this under the seatpost clamp. Depends on who you talk to it is either paint or the frame. What does it look like to you?