Looks like it's just the seatstay not the lug.
Second picture, top right. Another crack? This frame more hassle than it’s worth?
Looks like it's in the paint, like it's had a bit of tape stuck on it to me. That dark line below the lug on the seat tube looks more like a crack but it's hard to say from 1 pic online. Easier to tell in person and sand it back if it looks sus.
Looks like it, and is that one a cm or so under the lug on the seat tube too?
Ooof, and I thought Max was the tank like bomb proof tubing.
@PhilDAS started
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Looks like it's just the seatstay not the lug.