According to that criteria it was probably Ingemar Johansson who was also European (Sweden).
The 70's era heavyweights are actually somewhat over-rated in the view of most boxing historians. The art of old-time footwork and going to the body had just recently been "lost" while the mega athlete had not really arrived on the scene yet.
The top three fighters of all-time (any division) in the view of many historians are Ray Robinson, Henry Armstrong, and the little known Henry Greb.
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