As the Autavia collection evolved and the successive design changes were made in quick succession, a few variants came and went before the clearly refined form of what became known as the “Rindt” or 3rd Execution to collectors was settled on.

Just before, there was a brief run, around 1964 or 1965, when the subsidiary dials of the 1st execution were reduced in size, applied markers were fitted, with small luminous plots in tritium added at the tip. But the alpha hands, distinctive bezel, and strong case proportions remained.

These have become known as the 2nd execution to collectors and represent a unique design language that bridges the aesthetics of the early chronograph watches from Heuer with the modernist design language that arrived in full force with the Carrera in 1963 and would then find its way into other collections.

While Heuer chronographs of the era are defined by the three-register versions powered by the Valjoux 72, the two-register Valjoux 92 watches have a charm and a balance that cannot be denied. Providing symmetry and negative space on the lower half of the dial, they further increase the clarity of the design and minimalist ambitions, while still ensuring excellent functionality, particularly on those pieces with a 45-minute register. The 3646 Autavia would become the preferred watch of Mario Andretti, and also act as the basis for the celebrated, and incredibly rare, Indianapolis 500 models.