The Autavia Isograph represents TAG Heuer's 2019 rehabilitation of a nameplate dormant since 1986 — a lineage originating with Jack Heuer's dashboard-instrument-derived design of 1962. Vis-à-vis the original Autavia iterations, the contemporary reference WBE5112.EB0173 preserves certain formal continuities: the bi-compax chronograph layout, the rotating bezel, the deliberate sporting character. What distinguishes this particular variant is the Isograph designation itself, denoting a carbon composite hairspring manufactured without the parametric constraints of traditional silicon or Nivarox alloys. The Cal. Heuer 02T movement — produced in collaboration with Kenissi, the manufacture now shared among a consortium of Fleurier-adjacent brands — delivers 80 hours of power reserve and column-wheel regulation at a price point that represents a defensible proposition against Swiss competitors of comparable technical specification. Concordantly, the movement remains the most analytically persuasive element of this iteration. The case at 42 millimeters and 14.4 millimeters of thickness introduces a wearability constraint that predecessors, being thinner instruments of another ergonomic era, did not impose. The bracelet executes its function without distinction. The probability that this reference achieves lasting collector significance is tempered by the inevitability of its production volume and the increasingly competitive landscape among in-house sport chronographs at this price stratum.