A grand piano gets its sound inside the case, where hammers, strings, and a wide soundboard turn controlled force into tone. Franck Muller built this watch on the same idea. The case is a curved tonneau and the dial is deep black. Inside sits a new in-house hand-wound movement that stores energy on a long mainspring and lets it out slowly, at a steady low beat, for about a week on one wind.
Pricing starts at $30,447 for the stainless steel and 18K yellow gold version, reference CX36S6PRFOPIANOJ ACNR3N. A second version swaps the mix, putting 18K yellow gold on the case and stainless steel on the bezel, and it runs $36,843 as reference CX36S6PRFOPIANOJ 3NACNR. Both went on early sale at the Franck Muller Genève boutique in Ginza Six on November 6, and both reach boutiques across Japan on November 12.
Price: $30,447
Where to buy: Franck Muller Japan
Two more Franck Mullers, both on Amazon
The Piano sells only through Franck Muller boutiques in Japan, so it has no Amazon listing of its own. Amazon does stock the brand through marketplace sellers, and two of its Franck Muller listings carry the defining part of the Piano, the curved tonneau case from the same maker, at prices that bracket the Piano’s $30,447.
Franck Muller Casablanca Crazy Hours, $18,000 at Amazon. The Cintrée Curvex case is the Piano’s curve in its classic form, stainless steel, worn as a dress watch. The movement is automatic and runs the Crazy Hours layout: the hour numerals sit scrambled around the silver Iron Croco dial, and the hour hand jumps to the numeral the hour calls for. You give up the hand-winding and the week of reserve. You keep the maker, the shape, and a dial with a trick of its own.
Price: $18,000
Where to buy: Amazon
Franck Muller Vanguard Skeleton 7 Days, $51,900 at Amazon. This one matches the Piano on the movement side: hand-wound, built in-house, and made to run seven days on a wind, the same week the Calibre 1700 promises. The case is the larger Vanguard tonneau in 18K rose gold at 54 by 44 millimeters, and the dial is openworked down to the bridges, so the enamel’s gloss trades for a full view of the movement. It runs $21,453 past the steel-led Piano.
Price: $51,900
Where to buy: Amazon
| Grand Curvex Piano | Casablanca Crazy Hours | Vanguard Skeleton 7 Days | |
|---|---|---|---|
| Case | Tonneau (Grand Curvex), 53.1 x 36 mm, steel with 18K gold | Tonneau (Cintrée Curvex), stainless steel | Tonneau (Vanguard), 54 x 44 mm, 18K rose gold |
| Dial | Black enamel, 20 layers | Silver Iron Croco | Skeleton, openworked |
| Movement | Hand-wound Calibre 1700, in-house | Automatic, Crazy Hours | Hand-wound, in-house |
| Power reserve | About 170 hours | Not listed | 7 days |
| Price | $30,447 | $18,000 | $51,900 |
| Franck Muller Japan | Amazon | Amazon |
A dial stripped down to hands and one needle
Twenty layers of black enamel build the dial’s piano-black gloss. Layer after layer gives the surface a depth a single coat can’t reach, and it catches light the way a polished piano lid does. It’s the one flashy move on the whole watch, and it stays quiet about it.
Hour numerals are gone by design. Gold hands carry the time against the black, joined by the Franck Muller Genève name, a small seconds hand low on the dial, and one more hand at 10 o’clock. Nothing else prints on the face, so your eye goes straight to the gloss and the gold.
That 10 o’clock hand is the power-reserve indicator, and it changed form for this model. Earlier versions showed the reserve on a disc. Here it’s a pointer, a thin needle sweeping a small arc, which reads faster and suits a dial this empty. On a watch that runs seven days per wind, it’s also the dial’s most useful feature.
Calibre 1700 runs about 170 hours on one wind
Calibre 1700 is hand-wound and developed in-house. Wind it fully and it runs about 170 hours, close to seven days, before it needs another turn of the crown. A long mainspring holds the charge, and the movement releases it gradually instead of spending it fast.
Flip the watch over and the display caseback shows the hardware behind that claim. Engravings on the movement read Double Barrel and Twenty-Five (25) Jewels, with Cal 1700 S6 marked on the plate. Striped bridges, gold-toned gears, and ruby bearings fill the curved window, and the caseback of the steel-led reference is numbered 00/50, for a run of 50 pieces.
A slow, steady beat is the point of the design. Releasing stored energy at an even pace is what keeps a long-reserve movement accurate across the full week, not just the first day after a wind. It’s the piano logic again, applied to time: control the force and the result holds.
Winding becomes part of owning it. There’s no rotor doing the work in the background, so the watch runs only as long as the last wind lasts, and the needle at 10 o’clock tells you exactly where you stand. Owners of seven-day movements tend to settle into a weekly rhythm, same day, same few turns of the crown.
A curved case in two metal mixes
Grand Curvex means the case curves in three dimensions, bending along the wrist instead of sitting flat on top of it. Dimensions run 53.1 mm long by 36 mm wide, a tall tonneau shape that wears smaller than the length suggests because the ends turn down. The strap follows the same curve, built from calfskin over rubber.
Choosing between the two versions comes down to which metal leads. Steel leads on the $30,447 reference, with gold on the bezel, the crown, and the hands. Gold leads on the $36,843 reference and wraps the full case, while steel takes the bezel. The dial, the movement, and the strap stay identical either way, so the $6,396 step buys metal and presence, nothing mechanical.
| Reference | Case and bezel | Price | Production |
|---|---|---|---|
| CX36S6PRFOPIANOJ ACNR3N | Stainless steel case, 18K yellow gold bezel | $30,447 | 50 pieces |
| CX36S6PRFOPIANOJ 3NACNR | 18K yellow gold case, stainless steel bezel | $36,843 | Not stated |
Price: $36,843
Where to buy: Franck Muller Japan
Seven days of reserve, a dial with no numerals, and a case that bends to the wrist add up to a watch that asks you to slow down and wind it by hand once a week. If that ritual sounds like the point rather than the chore, the steel-led reference at $30,447 is the one to chase in Japan this month, and the gold-led version is there for buyers who want the same week of power wrapped in more gold.
