Soling or as a close second a Flying 15
Not the kind of boat I'd have a second look at today but back then they were superb.
Soling Yachts and the British Soling Association
Flying Fifteen (Flying 15) - Classes - Yachte.com.au
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke