Originally Posted by
juvela
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rudimentary information you might wish to relate to the readership includes steerer & bottom bracket threads as well as tube diameters
several makers did fork crowns of this pattern; the recesses on the faces narrow it down
bottom bracket shell looks to be BOCAMA Professional
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Sure. Dimensions match mid-tier 531, specifically 16mm x 11mm seat stays. 26.8 seat post. Fork crown is Haden (stamped)