Founders Edition · Limited First Series

Time, Carved in Jerusalem Stone.

An understated 39mm mechanical dress watch featuring a dial cut from natural honed Jerusalem limestone. Every dial carries a warm cream grain formed over millions of years—no two watches are alike.

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Sionne Reference 01 in Steel and Reference 02 in Warm Gold with honed Jerusalem limestone dials

Left: Reference 01 in 316L Steel ($618 Founders Target) · Right: Reference 02 in Warm Gold ($818 Founders Target) 39mm · Automatic · Sapphire

Sunlit ancient Jerusalem pale-beige limestone arches and masonry at golden hour

Sunlit Jerusalem limestone arches at golden hour—the inspiration behind every Sionne dial.

The Material

Warm Pale-Beige Stone, Honed to a Quiet Matte Finish.

For centuries, the architecture of Jerusalem has been defined by its local pale-cream limestone—a stone that shifts from soft ivory in the morning to warm gold at dusk.

Rather than painting or stamping a metal dial, we slice thin veneers of natural pale-beige limestone and hone the surface to a soft, non-glossy matte finish. Framed by a slender polished bezel and minimalist baton markers, the stone remains the sole centerpiece.

Macro detail of honed pale-beige Jerusalem limestone dial surface

Natural Honed Limestone Dial Blank · Every Grain Unique

Proportions

Balanced for the Wrist. Built for Everyday Elegance.

Inspired by mid-century dress watches, the 39mm case is sculpted with brushed flanks and a slender mirror-polished bezel that slips effortlessly beneath a shirt cuff.

Paired with a supple espresso-brown Italian calfskin strap and a true no-date mechanical movement, nothing interrupts the warm cream harmony of the stone dial.

39 mm Case Diameter

10 ATM Water Resistant

Sapphire Front & Back

Sionne 39mm Jerusalem stone dress watch worn on a man's wrist with a linen shirt and tailored jacket

The Founders Collection

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Reference 01 · Founders Edition Citizen Miyota 9039

Polished 316L Steel

Crisp architectural contrast between cool brushed-and-polished surgical steel and the warm cream tone of honed Jerusalem limestone. Powered by the ultra-thin Japanese Citizen Miyota 9039 true no-date automatic caliber, paired with an espresso-brown Italian calfskin strap.

· 39mm Brushed & Mirror-Polished 316L Steel Case
· Natural Honed Pale-Beige Jerusalem Limestone Dial
· Citizen Miyota 9039 Automatic (28,800 bph · 42h Reserve)
· Espresso Brown Quick-Release Italian Calfskin Strap

Founders Target Price

$618 USD / €518

Future Retail: $718 USD / €618

Details

Essential Specifications

Case 39 mm diameter · 316L stainless steel (Polished Steel or Warm Yellow Gold PVD)

Dial Natural honed pale-beige Jerusalem limestone · Applied metal indices & Dauphine hands

Movements True no-date automatic · Citizen Miyota 9039 (Ref. 01) or Swiss Sellita SW200-1b (Ref. 02) · 28,800 bph

Crystal & Caseback Flat sapphire crystal with internal anti-reflective coating · Screw-down sapphire exhibition caseback

Water Resistance 100 meters / 10 ATM

Strap Quick-release Italian calfskin leather (20 mm tapering to 18 mm) with signed buckle

The Journey

Founders Edition Timeline

01 · Now In Progress

Design & Stone Selection

Finalizing our 39mm case blueprints and selecting the finest pale-beige Jerusalem limestone blocks for dial slicing.

02 · Early 2027

Physical Prototypes

Complete assembly and water-resistance testing of the first Steel and Warm Gold watches, shared with waitlist members.

03 · Spring 2027

Waitlist Reservations

Waitlist members receive a private 48-hour link to reserve their numbered piece (300 watches) at the Founders price.

04 · Summer / Autumn 2027

Craft & Delivery

Precision assembly, individual movement regulation, and insured express delivery to Founders worldwide.

Inaugural Series · 300 Pieces

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