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@marxist_vulcan
Been speaking to a frame builder and he believes the forks are Reynolds and could be made 531 ST and that would explain the weight....it does have a steerer with thicker than usual walls....moreover from his experience...all sorts of forks have been made with 531 ST.....perhaps a bit like Columbus SP....like SL but for the heavier and more powerful cyclist.
So any of the heavier or more powerful cyclists of this forum interested???