Zenith and USM reunite on a one-off mirrored DEFY Chronograph for auction

Zenith and USM have reunited on a one-of-a-kind DEFY Chronograph built exclusively for TimeForArt, the benefit auction run by the Swiss Institute. The unique piece revisits the architectural design of the pair's 2025 collaboration, which reworked the angular 1969 DEFY, and adds a fully mirror-polished dial.

The mirrored dial

That reflective surface shifts with whatever surrounds it, so the watch changes appearance as light, movement and nearby architecture do. Set against the mirror are three overlapping azuré chronograph counters picked out in USM Golden Yellow, Pure Orange, Green and Gentian Blue.

Pulling all four of USM's signature colors onto a single dial is a first for the partnership. The rest of the watch keeps the earlier model's compact build: a 37mm stainless-steel case, an octagonal profile, a 14-sided bezel and a stainless-steel ladder bracelet.

A miniature version of USM Haller's signature ball joint is at the tip of the Gentian Blue chronograph seconds hand. It is the small bridge between the furniture system and the watch, the same modular logic shrunk down to a counterweight. Zenith powers the piece with its automatic El Primero 400 column-wheel chronograph calibre.

The El Primero 400 runs at 36,000 vibrations per hour and stores a 55-hour power reserve. Zenith is the Le Locle manufacture we cover in our watches and jewelry guides, known for the high-frequency movement that gave the line its name.

The sideboard

USM Haller is the Swiss modular furniture maker whose steel sideboards and shelving systems pair with the dial's colors here. For this lot the concept extends past the watch itself: USM has designed a one-of-a-kind mirrored Haller sideboard to accompany the chronograph.

Conceived as a functional display for collectors, the furniture piece carries a glass top that presents a primary collection layer. A lockable drawer below adds storage, so the modular design language of USM flows into horology with the same joinery system the brand sells by the unit.

The auction

As a unique piece produced solely for auction, the DEFY Chronograph USM – TimeForArt Unique Piece carries no official retail price. Phillips will call the lot in New York on December 5, 2026, at 3 p.m. EST, and the full hammer goes to the Swiss Institute.

The proceeds fund the Swiss Institute's exhibitions, education initiatives and community engagement programs, so the buyer's outlay lands in the arts rather than in a catalogue. Phillips is the auction house we have covered before in our scene reporting, including its recent online watch sales.

The lot is a reunion as much as a debut. Zenith and USM's first collaboration arrived in 2025, and this follow-up keeps the same case geometry while letting the dial turn reflective, a mirror that borrows the room it sits in.

That detail is the watch's point: it is not a fixed colorway but a surface that responds to its environment.

The octagonal profile and 14-sided bezel survive intact from the earlier collaboration, so the model reads as an evolution rather than a redesign.

A reader coming to this from our scene coverage will recognize the format: a unique piece, no retail price, and a benefit auction with a named beneficiary. What separates this lot is the sideboard, a piece of furniture with its own display case sold alongside a chronograph.

The mirrored sideboard is not a packaging gimmick but a lockable, glass-topped cabinet made to hold a watch collection. Its presence means the winning bid buys two objects at once, each finished as a one-off, and each drawing from the same mirrored surface.

We have rated the DEFY line before in our Zenith coverage, where the brand's recommended retail prices and story sit beside our notes on the El Primero. This unique piece sits outside that list by design: its value is set by the room on December 5, not by a price tag.

The dial's mirror finish is the through-line for the whole lot. It appears on the watch, it appears on the sideboard, and the four USM colors anchor both. For collectors of Zenith chronographs, the TimeForArt piece is a one-of-one that the earlier collaboration set up.

Nothing about it will be repeated: no production number, no retail allocation, no reference in a dealer window. When the hammer falls in New York on December 5, the piece passes to a single owner along with its sideboard, and the Swiss Institute collects the full amount.