There are many very subtle design differences between the chronograph wristwatches within the Autavia reference 2446 models that aren't always immediately obvious. This can be explained by the fact that Heuer's designs were intuitive and dependent on each particular task the watch was to perform. After immersing himself in the racing circuit, Jack Heuer produced the tachymeter bezels for the postulant racing drivers; recognising the surge in luxury travellers he added minutes and hours bezels for aspirational aircraft pilots.

In 1968, Heuer introduced the Compressor case, which was assigned the reference 2446C. This case modification increased the waterproofness of the watch with a new compression snap-on caseback. In addition to the new caseback, the case was also enlarged by almost 1,5 millimeters, the lugs were redesigned to appear more angular and the bezel was updated with groups of serrated teeth. Reference 2446C was available with a large choice of bezel graduations: Hours, Minutes, GMT or like the present example, a Tachymeter scale. These new features gave the watch a bolder and more masculine look but also made it one of the most comfortable Autavias to wear.

The present 2446C is in very appealing condition, displaying a crisp case, thick lugs and matte black dial. This watch is certainly a unique opportunity for Heuer collectors worldwide.