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How do you know from that the provenance isn't true?
I read online, and was confirmed by Winston that 531ST is a heavier gauge with a 27mm seat post, the Mercian taking a 27.2mm suggests "normal" 531. Down tube outer diameter is also smaller than on my Dawes.
I imagine the original seller didn't really know, I don't think they were trying to mislead people.
Sorry to hear that. Glad you're okay but shame about the mercian.
How do you know from that the provenance isn't true?