SB04-E TANTOSTER

Tantalum – The Metal of Rarity and Strength

The Dial Like No Other

At the heart of the TANTOSTER lies its dial, where the timeless beauty of guilloché meets the uncompromising strength of tantalum. The “grand panier” pattern, a basket-weave design deeply rooted in horological tradition, has been engraved on tantalum for the very first time in a production series of 10 watches.

To our knowledge, this marks a true world premiere: never before has this noble metal been decorated with such a motif on 10 watches. The result is a dial of remarkable depth and elegance, with light playing across its woven geometry in subtle, ever-changing reflections.

A Shared Vision

Founded in Denver, Colorado, Oster Jewelers has earned a reputation as one of America’s foremost destinations for independent watchmaking. With a deep commitment to artistry and a discerning eye for rare creations, Oster Jewelers connects collectors with exceptional timepieces that embody both tradition and innovation.

The partnership with Sartory-Billard is a natural extension of this vision, culminating in the TANTOSTER — a watch that unites classical craftsmanship with daring material exploration.

Its name, “TANTOSTER”, is a playful clin d’œil combining “Tantalum” and “Oster”, a subtle tribute to the collaboration at its core.

Tantalum – The Metal of Rarity and Strength

Tantalum is one of the rarest metals on Earth, prized for its extraordinary density, corrosion resistance, and unique hue. Its scarcity and difficulty to work with make it a true connoisseur’s material, seldom seen in watchmaking.

The challenges of machining tantalum are formidable. It resists cutting, rapidly blunts tools, and demands constant precision. In the creation of the ten dials for the TANTOSTER, the machine head was replaced many times, as tantalum relentlessly wore down each tool. This process required both patience and determination, underscoring the rarity and resilience of the material itself.

By engraving tantalum with the refined “grand panier” guilloché, Sartory-Billard elevates this most demanding of metals into a poetic canvas — merging endurance with artistry, permanence with elegance.

The SB04-E Signature

As part of the SB04-E line, the TANTOSTER carries the collection’s defining traits: a 39.5mm steel case with flowing curves and mirror-polished surfaces, water resistance to 100 meters, and luminous diamond-cut hands and indexes for optimal legibility in all conditions.

Each piece is individually crafted with Sartory-Billard’s signature approach: sincere, personal, and uncompromising in its pursuit of coherence and beauty.

A Collector’s Milestone

The SB04-E “TANTOSTER” is produced in a strictly limited series, available exclusively through Oster Jewelers in Denver. It represents not only a collaboration, but also a milestone in watchmaking: the first tantalum guilloché dials produced in a series, a union of heritage and innovation destined for collectors who seek the extraordinary.

Form around your Wrist

More than an object of precision, the TANTOSTER is a companion designed to live in harmony with its wearer. Its balanced proportions, gentle curves, and tactile finishes allow it to sit naturally on the wrist, revealing its play of textures and reflections with every movement. Each glance offers a new discovery — a reminder that true elegance is not static but alive, evolving with light, time, and presence.

Like all watches in the Sartory-Billard range, the 20 mm lugs are drilled to accommodate curved straps. This edition comes fitted with a leather strap in olive green with mustard lining from Scarlett Paris, complemented by a grey rubber strap for exceptional durability, water resistance, and ease of maintenance.

Technical Specifications

• Name: SB04-E Tantoster – Limited Edition for Oster Jewelers

• Case: Stainless steel, 39.5 mm, alternating polished and brushed surfaces

• Dial: tantalum dial guilloché with the traditional “grand panier” motif

• Movement: Swiss-made La Joux-Perret automatic movement, 68-hour power reserve

• Water Resistance: 100 meters

• Bracelet Options:
- Scarlett Paris leather strap in Olive green with mustard lining
- Sartory-Billard grey rubber strap with the logo buckle

• Edition: Limited to 10 units

• Price: USD $6850

• Availability: Exclusively through OSTER

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SB04-E TANTOSTER
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  • SB04-E TANTOSTER
  • SB04-E TANTOSTER
SB04-E TANTOSTER

SB04-E TANTOSTER

Limited to 10 units
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Technical Specifications

Name: SB04-E Tantoster – Limited Edition for Oster Jewelers

Case: Stainless steel, 39.5 mm, alternating polished and brushed surfaces
Dial: tantalum dial guilloché with the traditional “grand panier” motif

Movement: Swiss-made La Joux-Perret automatic movement, 68-hour power reserve

Water Resistance: 100 meters

Straps included:
- Scarlett Paris leather strap in Olive green with mustard lining
- Sartory-Billard grey rubber strap with the logo buckle

Edition: Limited to 10

Price: USD $6850

Availability: Exclusively through OSTER – https://www.osterjewelers.com/products/sartory-billard-sb04-e-tantoster