Apparently that did not occur until much later, perhaps sometime in the 1980s when John Surtees plunked down enough cash to get the first 25 gearkits built.
Also, until about 2008, the fourth gear in the five speed was at a 1.075 ratio, great for a road racer running at 6,000 rpm but not all that effective for a heavily laden road bike pulling up a hill at around 3,000 rpm and needing more oomph. After 2008 the fourth gear ratio was lowered to 1.15 to give a greater advantage when dropping down one gear. This made the gear spacing between 3rd,4 th, and 5 th more even.