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@neilbah2
Ive recently had a frame stripped, i was given it free but the thing was covered in blemishes, small dings etc Columbus tubing, mixture of Max and a couple other tubes fillet brazed. Anyhow previous owner had ridden it in all weather, turbo sweating all over it etc and after 25 years of abuse it was looking rough with some orange pitting visible in places. on advice from a frame builder it was vapor blasted to see if it was worth saving and if any holes appeared.. there were a few pits and a braze on cablestop that was extremely thin as expected . In terms of a comparison with yours...Your tube looks so heavily cleaned up that its not even cylindrical anymore, as if someone persevered to get rid of a pit by sanding at it until a far larger area has cratered because it has become thin. Its very odd which makes me think theres a combination of things going on. The frame wasnt treated or cleaned properly post build and contaminants gave the corrosion a head start. Might have already been thinner than spec with a blasting process pre paint? or that the current paintshop did something too aggressive. - i'm inclined to believe this one. It should have just been acid etched after a lighter blast, dipped or what have you, a little bit of silver/brass filling to any dings and have been perfect.