Aquatimer Split Minute Chronograph

The IWC Aquatimer Split Minute Chronograph stands out for its ingenious complication: a split-minute timer, allowing divers to measure two intervals underwater—an innovation unique to IWC’s lineup. Originally launched in the early 2000s, this model brought a new level of timing precision to the Aquatimer family, which is already celebrated for its professional diving pedigree. Collectors value its limited production run and the technical achievement of integrating a split-minute function in a robust, purpose-built diver.

Key references to know are IW3723 and its variants, each featuring a substantial 44mm stainless steel case and the proprietary Caliber 79470 automatic movement. The split-minute mechanism is operated via a discreet pusher at 8 o’clock, separate from the main chronograph controls, making it both practical and mechanically fascinating. Water resistance is rated at 120 meters, more than sufficient for recreational diving and everyday wear, while the internal rotating bezel—controlled by an external crown—ensures precise elapsed time tracking without risk of accidental movement.

Price variation is driven by condition, completeness (box and papers), and the presence of the original rubber strap or bracelet. Early examples with full sets and minimal wear command a premium, while later service dials or aftermarket bands can reduce desirability. The split-minute complication is unique to this reference, so verify correct pusher function and smooth operation when inspecting a piece. This model rarely appears on the market, making it a compelling choice for those seeking a technically advanced diver with genuine IWC innovation.