Interesting find yesterday which has helped identify the BB Shell as Haden cast. The bike pictured is owned by the father of my brother-in-law who I saw yesterday. It’s a 1988 Jon Houston (Australian builder) built frame from Reynolds 531 Professional tubing. When I turned the bike over I saw exactly the same shell looking back with the same casting mark. Nothing else on the bike resembled my build but it was great to now have a 531 Pro frame for reference against mine and to definitively place the BB shell. Jon built 59 frames (this is No. 26) between 1986 - 1993 and is about to embark on No.60 according to his website www.vintagemotorgarage.com