Among the 107 lots that open Phillips Geneva Watch Auction XXIV on 7 November is a watch that most bidders will scroll past: Lot 88, a 1954 Vacheron Constantin Ref. 4261 in platinum, estimated at CHF 200,000–400,000. Aurel Bacs didn’t scroll past it. The senior consultant at Bacs & Russo named it his personal hidden-gem pick for the sale — and when one of the world’s leading auction specialists singles out a lot that sits between a Patek Philippe perpetual calendar and a clutch of Rolex Daytonas, it is worth pausing to understand why.
Quick take
- Lot 88, Phillips Geneva Watch Auction XXIV — Session I, 7 November 2026
- 1954 Vacheron Constantin Ref. 4261, 36mm platinum minute repeater
- Made to order for Muhammad VIII al-Amin, the last Bey of Tunis; Arabic inscription on dial
- One of only four known platinum examples — each with a different dial
- Aurel Bacs’s personal hidden-gem pick for the entire sale
- Estimate: CHF 200,000–400,000 (~USD 244,000–488,000 / ~SGD 330,000–660,000)
| Reference | 4261 |
| Year | 1954 |
| Case material | Platinum |
| Diameter | 36 mm |
| Thickness | 5.25 mm (movement: 3.1 mm) |
| Movement | Manual wind, 13-lignes calibre, 29 jewels, minute repeating |
| Movement No. | 501’912 |
| Case No. | 328’065 |
| Dial | Cream, Arabic numerals, “Muhammad al-Amin the First” in Arabic script |
| Auction | Phillips Geneva Watch Auction XXIV, Lot 88 |
| Session | Session I, 7 November 2026, 2:00 PM |
| Estimate (CHF) | 200,000–400,000 |
| Estimate (USD) | ~244,000–488,000 |
| Estimate (SGD) | ~330,000–660,000 |
A watch made for the last sovereign of Tunisia
Muhammad VIII al-Amin ruled as Bey of Tunis from 1943 to 1957 — a period that encompassed the final years of French colonial rule and the country’s transition to independence under Habib Bourguiba. When Tunisia became a republic in July 1957, al-Amin, known to his court as Lamine Bey, was deposed and lived the remainder of his life in modest retirement in Tunis, dying in 1979. He was the last in a line of Ottoman-descended rulers that stretched back to the seventeenth century, the final holder of a sovereignty that had endured three hundred years.
It was during his reign that Vacheron Constantin made this watch. The dial, cream with an Arabic numeral chapter ring, carries an inscription in Arabic script reading “Muhammad al-Amin the First” — a declaration of royal identity worked directly into the timekeeping instrument. The case is platinum, 36 mm across: compact by today’s standards, but precisely calibrated for a ruler’s wrist. The manufacturer provided an Extract from the Archives confirming the movement and case numbers, and the original lot is accompanied by a large leather travel pouch and outer packaging.
The watch first appeared at auction in 2002. At that point, the original maker’s signature on the case — Vacheron Constantin’s name — had been removed at some earlier stage, a detail the current Phillips catalog notes with unusual candor. Whether this occurred at the Bey’s court, in the years following his deposition, or somewhere in the subsequent chain of private ownership is not documented. The archives extract confirms the movement and case numbers beyond question.
The mechanism: why a minute repeater from 1954 commands attention
A minute repeater is the most demanding of all traditional watch complications to manufacture. When the wearer depresses a slide on the case band — positioned here on the left flank of the case, giving away its function at a glance — a rack-and-snail system reads the position of the time train and triggers a sequence of chimes: deep gongs for the hours, two-tone pairs for quarter hours, and high notes for the remaining minutes. Pressing the slide on this watch at, say, 3:47 PM would produce three low strikes, three high-low pairs, and two high strikes. The entire sequence unfolds in a movement 3.1 mm thick.
The Ref. 4261’s 13-lignes calibre (a “ligne” is a traditional French unit of measurement; 13 lignes is approximately 29.3 mm across) executes all of this in a 5.25 mm total case thickness. The movement contains 29 jewels and was built without a subsidiary seconds dial — a rare configuration that simplifies the layout and reduces the number of concentric components competing for space. In 1954, this level of miniaturised precision was the result of decades of accumulated craft knowledge at Vacheron Constantin’s workshops in Geneva and Le Sentier.
What separates this example from other Ref. 4261s is the case metal. Vacheron Constantin produced the 4261 predominantly in yellow and white gold. Platinum versions were bespoke royal commissions. According to the Phillips catalog, only four platinum Ref. 4261s are currently documented, and each carries a different dial configuration. The coral-dial example sold at Phillips Geneva in 2019 realised CHF 187,500 — nearly double its high estimate of CHF 100,000. The royal provenance and unique Arabic dial inscription on Lot 88 place it in a distinct category from that watch, but the 2019 result establishes a meaningful floor for comparable platinum examples.
Market context: where this sits in the current cycle
The broader auction cycle has been sending bifurcated signals through 2026. Our October auction month wrap documented a market in which blue-chip references with strong provenance are holding firm, while standard examples of previously fashionable references have softened. Minute repeaters with royal or diplomatic provenance — a category that sits at the intersection of scarcity and documented history — have largely been the exception to that softening, precisely because they cannot be replicated and rarely surface twice within the same generation of buyers.
Among the lots at Phillips XXIV with greater headline visibility — a Patek Philippe Ref. 1436 chronograph at CHF 2–4 million, an F.P. Journe Résonance at CHF 1–2 million, and the Cartier Portico No. 4 at CHF 1.8–3.2 million — Lot 88 sits at an estimate that looks almost modest. The broader question of how unique provenance translates to long-term secondary market value applies here, but with an added variable: there are, as of this writing, no other platinum Ref. 4261s with equivalent documentation known to be available on the open market. The estimate range of CHF 200,000–400,000 implies a baseline that would still represent a fraction of what the documented top lots in this sale are expected to achieve.
Session I, Lot 88: how to bid
Geneva auction week runs 6–9 November, with sessions at Phillips, Christie’s, Sotheby’s and Antiquorum across two days. The full session schedule and online bidding guide covers all four houses. For Lot 88 specifically: Session I begins at 2:00 PM on 7 November at the Hotel President Wilson, Quai Wilson 47, Geneva. The preview runs 4–8 November (Wednesday through Friday 10AM–7PM, Saturday 9AM–7PM, Sunday 9AM–1PM).
Phone and online bidding are available through Phillips’s platform. Registration requires identity verification and must be completed in advance of the sale. Instructions and the registration form are on the auction’s overview page.
Sources: Phillips lot 88 — Vacheron Constantin Ref. 4261; Phillips Geneva Watch Auction XXIV overview. Lot page last accessed 2 November 2026. Currency conversions approximate at the time of publication; CHF/USD and CHF/SGD rates are indicative only.
A minute repeater is a mechanical watch complication that chimes the time on demand when the wearer activates a slide on the case band. The mechanism triggers a sequence of strikes: deep gongs for hours, two-tone pairs for quarter hours, and high notes for the remaining minutes. Building a minute repeater requires dozens of precisely fitted components — hammers, gongs, racks, snails — all within a movement measured in millimetres. A high-quality example from a house such as Vacheron Constantin, Patek Philippe or Audemars Piguet requires hundreds of hours of skilled assembly, which is why examples command six-figure prices new and frequently appreciate at auction.
Registration for Phillips Geneva Watch Auction XXIV is handled directly through Phillips. Visit the auction overview page on phillips.com, select the register-to-bid option, and complete the identity verification and deposit requirements before the sale date. Phone and online bidding are both available. Session I — which includes Lot 88, the Vacheron Constantin Ref. 4261 — begins at 2:00 PM on 7 November 2026 at the Hotel President Wilson, Quai Wilson 47, Geneva.
Muhammad VIII al-Amin (Lamine Bey) was the last ruling Bey of Tunis, reigning from 1943 until Tunisia became a republic in 1957. Royal or diplomatic provenance raises auction prices for two reasons: it provides a documented chain of ownership that validates the object’s authenticity and history, and it adds historical significance that generic examples lack. Watches commissioned by heads of state are typically unique orders — bespoke dials, engraved inscriptions, precious metal cases — and rarely appear on the open market more than once per generation.
The official auction estimate for Lot 88 is CHF 200,000–400,000. At approximate rates at the time of publication, this equates to roughly USD 244,000–488,000 and SGD 330,000–660,000. Final hammer prices can differ significantly from pre-sale estimates, particularly for lots with exceptional provenance. A comparable platinum Ref. 4261 with a coral dial sold at Phillips Geneva in 2019 for CHF 187,500, nearly double its high estimate.
Phillips currently documents only four platinum examples of the Ref. 4261, each with a different dial. The reference was produced primarily in yellow and white gold; platinum versions were individual royal or diplomatic commissions. The four known examples include Lot 88 (the Bey of Tunis watch), a coral-dial example sold at Phillips Geneva in 2019, and two others in private collections. No other platinum Ref. 4261 with documented provenance of comparable significance is currently known to be available.
