Skip to content
The Encyclopedia of Horology

Wristwatch · Wristwatch

Greubel Forsey Double Balancier Convexe S2

Partially verified

The Greubel Forsey Double Balancier Convexe S2 is a technical wristwatch featuring a titanium case designed with the Convexe ergonomic architecture. The watch is distinguished by its movement equipped with dual balance wheels, each inclined at a 30-degree angle. These balance wheels are coordinated by a spherical differential and a constant-force remontoire d'égalité mechanism, intended to achieve uniform power distribution and improved timekeeping precision. The dial features an open, skeletonized construction that reveals the movement components, manual finishing, and mechanical activity. According to the provided information, this model was produced in a limited edition of 66 pieces. The watch is worn on a black textile-style strap. Technical specifications regarding dimensions, service history, or specific functional status were not provided by the source.

Front view of the Greubel Forsey Double Balancier Convexe S2 on a wrist, showing the skeletonized dial and movement bridge layout.
Front view of the Greubel Forsey Double Balancier Convexe S2 on a wrist, showing the skeletonized dial and movement bridge layout. — Hairspring / Zamanito. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Wristwatch
Maker / attribution
Greubel Forsey
Reference
Not recorded
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
Not established
Source-reported place
سوئیس

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Movement and Chronometry

The timepiece is powered by a complex movement featuring a Double Balancier system. Two balance wheels are oriented at a 30-degree inclination to minimize gravity-induced errors. This setup is managed through a spherical differential which serves to average the rates of the two oscillators.

To ensure optimal energy delivery, the movement integrates a constant-force mechanism known as a remontoire d'égalité. This system assists in providing a uniform distribution of torque to the oscillators, which is designed to improve the chronometric performance of the movement throughout the power reserve. The movement is visible through an open dial layout.

Evidence for this section
  • “کالیبری پیچیده با دو چرخ لنگر (Double Balancier) است که هر یک با زاویه ۳۰ درجه انحراف قرار گرفته‌اند”
  • “انرژی و حرکت این سیستم دوگانه از طریق یک دیفرانسیل کروی (Spherical Differential) و مکانیزم رمونتوآر (Remontoire d'égalité) هماهنگ و تنظیم می‌شود تا توزیع یکنواخت نیرو تضمین گردد.”

Case and Design

The watch is housed in a titanium case characterized by the brand's Convexe design, which features an ergonomic, curved geometry. The case is constructed from lightweight titanium. The dial architecture is skeletonized, exposing the bridges, wheels, and technical elements of the internal movement.

The watch is presented on a textured strap, which is visually consistent with modern, sporty design standards for this collection.

Evidence for this section
  • “قاب این ساعت از جنس تیتانیوم سبک و مقاوم ساخته شده”
  • “تلفیقی از مهندسی کرونومتری پیشرفته و رویکرد طراحی مدرن و اسپرت در ساختار قاب Convexe است”
  • “معماری باز و اسکلتون‌مانند صفحه نمایش امکان مشاهده ریزه‌کاری‌های این سازوکار پیشرفته، پرداخت‌کاری‌های دست‌ساز و قطعات مکانیکی متحرک را فراهم می‌آورد.”

Production and Provenance

The model is documented as a limited production piece, with a total of 66 units manufactured in a titanium case.

The information provided by the source is a summary of documentation and does not include specific provenance details, service records, or dimensions for the watch. The auction description serves as the basis for these details and provides no independent certification regarding the mechanical health or authenticity of the object.

Evidence for this section
  • “تنها ۶۶ نمونه از آن در بدنه تیتانیومی ساخته شده است”
  • “کمپانی روبِل فورسی (Greubel Forsey) در تاریخ ساعت‌سازی مدرن سوئیس به عنوان یکی از پیشگامان اختراعات بنیادین در حوزه دقت‌افزایی و ارتقای مکانیزم‌های کرونومتری و توربیلون شناخته می‌شود”
  • “زمانیتو هیچ‌گونه تأیید مستقل یا تضمینی در خصوص اصالت قطعات، سلامت مکانیکی یا مشخصات اعلامی ارائه نمی‌دهد.”

Open research questions

  • What are the exact case dimensions of this specific S2 titanium reference?
  • What is the specific movement caliber number designated by the maker for this model?

Source evidence

Recorded claims and source quotations for Greubel Forsey Double Balancier Convexe S2
FieldSource-reported valueSource quotation
MakerGreubel Forsey“کمپانی روبِل فورسی (Greubel Forsey)”
ModelDouble Balancier Convexe S2“ساعت مچی Greubel Forsey مدل Double Balancier Convexe S2 تیتانیوم”
Limited Edition66 pieces“تنها ۶۶ نمونه از آن در بدنه تیتانیومی ساخته شده است”
Case MaterialTitanium“قاب این ساعت از جنس تیتانیوم سبک و مقاوم ساخته شده”
Movement FeaturesDual balance wheels inclined at 30 degrees“کالیبری پیچیده با دو چرخ لنگر (Double Balancier) است که هر یک با زاویه ۳۰ درجه انحراف قرار گرفته‌اند”
Regulation SystemSpherical differential and remontoire d'égalité“دیفرانسیل کروی (Spherical Differential) و مکانیزم رمونتوآر (Remontoire d'égalité)”

Visible details

  • Open-worked dial revealing movement components
  • Dual balance wheels positioned at 30-degree angles
  • Titanium case with curved Convexe profile
  • Black textured strap with branded deployant clasp

Research qualifications

  • No specific dimensions provided in source
  • No service history or functional verification reported

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت مچی Greubel Forsey مدل Double Balancier Convexe S2 تیتانیوم

Reviewed 2026-11-02 · Record 9838ca5f03

Terms in this record

Glossary explanations for terms named in this object’s record.

Other wristwatch records