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Deleted member 69416
Do you know if the threading on the bottom bracket is English ? I'm no expert but if it's English and if it's Reynolds and has a 27.0 mm seat pin then it could be 753 which at that time was used by a very small number of builders {Raleigh , Harry Quinn and Bob Jackson}. Mercian didn't use it until 1979/80 . IIRC Special Tourist tubing is 27.2 , Super Tourist was 27.0 but that came later .
For what it's worth the fork rake is similar to my BJ too .
For what it's worth the fork rake is similar to my BJ too .