The "Autavia," introduced by Ed. Heuer & Co. in 1962, was the first Heuer chronograph with a model name - earlier models were simply identified by their reference numbers. The Autavia was available in two versions: one with three registers (reference 2446) and one with two registers (reference 3646). First iterations Autavias showcased oversized registers, later labeled by collectors as "Big-Subs". First execution dials had radium applied lume and are signed "Swiss" in the lower part of the dial, above the numeral “6” for the two-register model. The hands of the first Autavias models are dauphine shaped, with the first execution hands being “all lume” applied like the present example. The two-register model powered by the Valjoux 92 movement interestingly carry no movement number in contrast with the three-register model that are powered by a Valjoux 72 and have movement numbers on the bridge.

The present Autavia "Big Sub" with 1st execution dial is preserved in excellent overall condition - the case retains its original proportions and the numbers between the lugs are crisp. The watch exhibits all the correct first series reference 3646 attributes; large subdials, shallow Ed. Heuer "one-step" case back, small pushers and dome crown. The rotating hour division bezel (with lume piece) was yet another invaluable instrument for professionals. Marketed originally as for pilots, sportsmen, divers and scientists the present timepiece is a rare opportunity for collectors of historically important chronographs and definitely an opportunity not to be missed.