Interesting looking at that.
- Fascinating idea looking at the pump pegs
- The down-tube decals on the Coronation don't seem right either.
- There are few other nice models with 531 and smaller decals close to the down-tube gear lever, but like you say 27"
- The geometry diagrams are interesting and state a 27" close clearance design too. Would that correspond to sprint rims in 700c size or something simply not intended for mud-guards? I don't know enough of the timelines when sprint rims in 700c size started to become available in the British Isles, but a serious club racing cyclist would know a bit what was happening on the continent. Dunno. Just guesses.
Never before did a newbie who joined Retrobike pick such a great user name
It is a freaking nightmare, at least there are catalogues with photographs instead of line drawings like the French did
Would looking at the +/- 1 year catalogues help any? As we know things were never that exact.
Ultimately though like you said, if an inflated 700 x 28C fits (even without mudguards) the bike is saved and usable again for summer day riding.