To the modern eye his achievements read like something from fantasy - in addition to winning the F1 title in record time he also within those 12 months bagged the Indianapolis 500, two F2 championships as well as took a couple of race victories each in sports cars and in saloons.
You may be wondering at this point what the heck I'm on about - but time was that the F1 annual schedule on top of the points-paying stuff had a handful, and sometimes a big handful, of Grands Prix that didn't count towards the title scoring. The non-championship races that I mentioned.
Britain was especially well-served by them, with the International Trophy at Silverstone taking place as an F1 event almost every year between 1949 and 1978, the Race of Champions (not to be confused with its current namesake) at Brands Hatch which was first held in 1965 and last happened in 1983, and the Oulton Park Gold Cup which existed as an F1 race on and off from 1954 to 1972. Therefore British fans of a certain vintage could have seen F1 cars racing on three separate occasions - and not one of them the British Grand Prix - before even the spring was out.
In 1965 in addition to everything else Clark took part in four non-championship F1 races; 12 if you include the Tasman Series, a succession of races in Australia and New Zealand for old-spec F1 cars. And he won seven of them, natch.
And why did they exist? For a variety of reasons. Sponsors would get an additional airing (which is why a lot of them were in Britain, as at the time many of the sponsors were British). Additionally they would be treated as de facto test sessions and shakedowns by the teams before the business part of the season in European summer kicked off - it wasn't coincidence that the bulk of these races were held in springtime. The rest of us outsiders looking in meanwhile had welcome extra opportunities to see the cars up close, as well as to get a few hints at the year's lay of the competitive land. Their more relaxed atmosphere relative to a championship race also added to the attraction.
Occasionally too the non-championship rounds acted as a dry run for new venues before they got onto the championship schedule proper, as was the case for Mexico City, Imola and Interlagos among others. But even over and above all of these reasons there were a few of the weird and wonderful among them - such as in 1974 when the fraternity was invited to remain in Brazil for an extra week after the points-paying Grand Prix at Interlagos to attend a street race in Brasilia, put on for a variety of political reasons by the country's then-President. He named the race after himself in case anyone didn't get the message. As it was only half of the field took up the offer and the race reportedly was tepid. The locals did get the consolation of home hero Emerson Fittipaldi winning, but F1 machines never laid rubber on the place again.
But have matters turned back in recent times? Or rather should they? As while in the age of 24/7 testing one can understand why the non-championship round became extinct, in the current age of severe testing restrictions what exactly is stopping the resurrection of the non-championship F1 race?
As veteran journalist Alan Henry put it: 'We loved 'em! And just imagine how much you would still love 'em now if, as you read this on the sunny Sunday of the May Day Bank Holiday weekend, instead you were en route to Brands Hatch or Silverstone or indeed even Oulton Park to watch a Non-Championship Formula 1 race involving Jenson Button, Checo Perez, Fernando Alonso...'
And indeed when I raised the subject of Clark's decorated and choc-a-bloc 1965 year on Twitter, and its non-championship F1 rounds, I got into a pleasant conversation therein in which we spoke about these sort of races being brought back, and the many potential advantages of doing so.
And while the testing restriction of course has been been brought in to save costs, the ticket sales from having a race to offer to fans (surely which would far outstrip the attendance for a test session) could well make up for the greater running costs.
Just like back in the day new venues wanting onto the championship proper could be tried out too. Mooted changes such as to the weekend's running - such as two-day race weekends, or Formula E-style squeezing everything into a single day - could be experimented with. So could shortened races, or running things in heats.
Best of all classic and popular venues could be brought back, with a reduced hosting fee. Having the calendar peppered with F1 rounds at Imola, France, Estoril and elsewhere - that famous long list priced out of the current inflated market - is rather enticing even if they didn't count towards the title.
But herein lies a stumbling block; probably an insurmountable one, at least for now. Surely, and sadly, Bernie would not welcome being undercut. Having the option for a cheaper Grand Prix would have a downward impact on the hosting fees that could be demanded everywhere, as the negotiating circuit suddenly has a fall back, rather than facing the choice of a Grand Prix at top dollar or nothing. So non-championship rounds in these terms would undermine what is central to F1's financial model right now.
Therefore, regrettably, that while the non-championship round seems a good idea it's also one that will likely have to wait for the post-Bernie age, or else a revision to the fundamental of modern F1's revenue-raising. More's the pity.