2005 Audemars Piguet Equation of Time - Box and Papers (Ref. 25934BC)

History and Significance

The Jules Audemars collection has always represented the more classical side of Audemars Piguet, focusing on traditional watchmaking rather than the sport-oriented identity of the Royal Oak. Within that lineup, the Equation of Time is one of the most technically ambitious watches the brand has produced.

This reference combines a perpetual calendar with an equation of time complication, sunrise and sunset indications, and a rotating city chapter specifically calibrated for a chosen location. In this case, the watch is configured for Akashi, Japan, which is engraved directly on the case. The equation of time complication itself measures the difference between solar time and conventional clock time, a function rooted in astronomical observation and rarely seen in modern wristwatches due to its complexity.

The layout is undeniably dense, but highly intentional. Every display serves a purpose, yet the watch maintains balance through the symmetry of the subdials and the restrained black dial execution. Encased in white gold, it carries substantial weight on the wrist while remaining elegant in profile.

Writer’s Thoughts

This is the kind of watch that reminds you how deep traditional watchmaking can actually go. Most perpetual calendars already feel complicated enough, but the Equation of Time takes it into another category entirely. There is so much information on the dial, yet after wearing it for a bit, it starts to make sense in a surprisingly intuitive way. What I like most is that it does not feel flashy despite how complicated it is. The white gold case and grey dial keep it understated until you really start looking closely. Finding one complete with the original hang tag, pusher, service papers, and deployant makes a huge difference, especially in this condition. The sharp hallmarks on the lugs tell the story immediately.

Our Promise

Every watch is thoroughly vetted, carefully described with complete transparency, and guaranteed authentic. Each piece is offered in honest condition, ensuring collectors receive a timepiece that reflects both originality and integrity.

Brand: Audemars Piguet

Model: Jules Audemars Equation of Time (Ref. 25934BC.OO.D002CR.01)

Year: circa 2000s

Case Material: White gold

Case Size: 36mm

Bezel: White gold bezel engraved for Akashi, Japan

Dial: Grey dial with perpetual calendar and equation of time displays

Movement: Automatic

Strap/Bracelet: Black leather strap

Buckle/Clasp: Audemars Piguet white gold deployant clasp

Contents: Complete set with box, papers, original hang tag, pusher, and AP service papers

Case: Excellent overall condition with almost no visible wear; hallmarks on the lugs remain deep and crisp.

Dial: Clean with no visible imperfections or damage.

Hands: Excellent condition with no visible wear.

Crystal: Clean with no noticeable scratches.

Strap/Bracelet: New strap fitted to the original Audemars Piguet deployant clasp.