APPF Edition — Hybrid Nylon/Calfskin Strap
The Audemars Piguet Code 11.59 series presents one of the most complex case geometries in modern horology, and the APPF (APP Factory) execution of the Tourbillon Openworked 26600CR stands as a rigorous technical achievement. This specific release is notable for successfully replicating the notoriously difficult double-curved sapphire crystal, which curves vertically on the exterior while remaining domed on the interior. Combined with a precisely milled octagonal mid-case, it offers the correct optical depth required for an openworked dial.
At the core of this model is a custom Caliber 2948 manual-winding clone movement. Unlike standard open heart modifications, this caliber features a genuine 60-second flying tourbillon escapement positioned at 6 o’clock, alongside a visible mainspring barrel at 12 o’clock. The vertical alignment and tri-tone grey bridge treatments closely mirror the genuine architecture. Power reserve is strictly rated at approximately 36 hours, requiring disciplined daily winding.
The 41mm dual-tone case is machined to a precise 13.9mm thickness, weighing in at a highly wearable 80.6g. The grey openworked dial features sharp, multi-layered bridges with alternating brushed and polished bevels. The hybrid nylon and calfskin strap integrates cleanly into the skeletonized lugs, securing with a standard AP folding clasp.
- Movement: Custom Caliber 2948 Clone — Approximately 36 hours
- Case Material: Dual-tone steel/alloy architecture, 41mm diameter, 80.6g weight
- Bezel: Ultra-thin round profile, polished finish
- Crystal: Double-Curved Sapphire Crystal with high-clarity AR coating
- Bracelet: Hybrid Nylon/Calfskin with AP folding clasp
- Water Resistance: 30m stated — professional pressure test recommended before swimming
This piece appeals to collectors who appreciate avant-garde horological architecture and the mechanical visual theater of a flying tourbillon. It requires careful manual winding and is best suited for controlled wear rather than rigorous daily use.

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