Audemars Piguet Ultra-Thin Tourbillon 25643, 25656 Specs

The Audemars Piguet reference 25643, introduced in 1986, holds a significant position as the first serially produced self-winding tourbillon wristwatch. This model was notable for its technical achievements at the time of its release, featuring a front-facing tourbillon cage, a design element that allowed for direct appreciation of the complication on the dial. Its introduction marked a notable development in the integration of the tourbillon into a wrist-worn format.

This reference is housed in an 18k yellow gold case measuring 30.5mm in diameter and 4.8mm in thickness. It is powered by the automatic Caliber 2870, which incorporates a hammer/bumper self-winding mechanism, with the blued AP hammer visible on the dial. The movement provides a power reserve of 48 hours. A sapphire crystal protects the white dial, which prominently displays the tourbillon.

For collectors, the reference 25643 is recognized for its historical importance in the evolution of the tourbillon wristwatch. Its technical characteristics, particularly the Caliber 2870 and its visible self-winding mechanism, contribute to its appeal. A bracelet variant, reference 25656, was subsequently introduced in 1987, offering an alternative to the leather strap of the 25643.

The Audemars Piguet reference 25656 is a significant early self-winding tourbillon wristwatch, introduced in 1987 as the bracelet variant of the groundbreaking reference 25643. It shares the distinction of being among the first serially produced self-winding tourbillon wristwatches, building upon the technical achievements of its predecessor. This reference is notable for its integrated bracelet design, offering a distinct aesthetic and wearing experience compared to the leather strap version.

This timepiece is powered by the caliber 2870, a self-winding movement featuring a unique hammer/bumper mechanism. The blued AP hammer is visibly exposed on the dial, providing a direct view into the watch's innovative winding system. The case material is typically platinum, housing the intricate tourbillon escapement which is presented on the dial side, allowing for immediate appreciation of its function.

For collectors, the reference 25656 represents a pivotal moment in modern horology, marking Audemars Piguet's pioneering efforts in miniaturizing and automating the tourbillon complication. Its technical innovation and historical importance make it a sought-after piece for those interested in the evolution of high-complication wristwatches and the brand's legacy in advanced watchmaking.