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a random guess would be seat tube is max steel
All three of them? I guess the split seat tube could be two max chainstays. The downtube looks like it has been used the wrong way round, should be ovalised vertically at the headtube, horizontally at the BB, in accordance with the direction of the load, no?
William.
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looks like super record with short fluting, the seat post tube on the frame looks like its been built to accommodate the post to the tube and stay
a random guess would be seat tube is max steel