Too hard to say from those photos.

I would not say it is normal for a Klein to have a line like that at a weld-line. But could it merely be a scratch? I could be a crack too, I just can't tell from that photo.

But, I have never seen a Klein with a less than impeccable weld, with well-shaped contours. So, I am fairly confident in saying that is something post-factory going on there. If a scratch, then perhaps no big deal. If more, then I would not touch it.

jim