Omega Calibre 3861
Buyer meaning: A serious modern Moonwatch movement: better precision testing, better magnetism resistance and better daily usability than 1861, while keeping the traditional manual-wind Moonwatch character.
Quick answer
What is the Omega Calibre 3861?
A serious modern Moonwatch movement: better precision testing, better magnetism resistance and better daily usability than 1861, while keeping the traditional manual-wind Moonwatch character.
- MovementIntel
- 86/100
- Jewels
- 26
- Power reserve
- 50h
- Linked watches
- 1
Why this movement matters
Power reserve
50 hours means you can take the watch off over a weekend and it will usually still be running Monday morning.
Frequency
21,600 beats/hour / 3 Hz is a common modern automatic rate. Higher frequency can improve stability in some conditions, but service access and long-term ownership matter more than Hz alone.
Certification
COSC and METAS Master Chronometer means the movement passed an independent timing standard before leaving the factory. That is useful, but it does not replace long-term ownership feedback or service network access.
Serviceability
Service through Omega authorised centres globally. The Co-Axial escapement can extend lubricant life at the escapement compared with traditional lever designs. Master Chronometer servicing requires factory-trained technicians. Typical interval: 5 to 7 years. Moderate cost by luxury standards.
Movement origin
WatchIntel classifies this as Omega manufacture / Lemania-derived architecture. Origin labels matter because they affect service access, resale narrative and whether marketing language matches what is actually inside the case.
Finishing
Rhodium-plated bridges with Geneva stripes (Moonshine gold variant on select models) Finishing on tool-watch calibres is often practical rather than exhibition-grade. That is not automatically a flaw if the movement is robust and well regulated.
Score breakdown
Lemania 1873 / 861 lineage evolved with Co-Axial escapement and Master Chronometer certification.
High confidenceMETAS Master Chronometer testing and Co-Axial regulation exceed generic chronograph claims.
High confidenceApproximately 50 hours is adequate but not class-leading for a modern chronograph.
Medium confidenceStrong magnetic resistance and proven Moonwatch chronograph architecture.
Medium confidenceModern Co-Axial Master Chronometer chronograph; best through Omega authorized service.
Medium confidenceMajor Omega engineering on a shared chronograph lineage, not a generic off-the-shelf movement.
High confidenceVisible through sapphire caseback on 002; industrial chronograph finishing, not haute horlogerie.
Medium confidenceStrong movement inside Moonwatch pricing, but not a value movement on its own.
Medium confidenceMovement honesty
Public label: Omega manufacture / Lemania-derived architecture
A known base calibre with meaningful brand-specific modifications, modules or regulation work.
Source nuance: 3861 is an Omega manufacture calibre in the modern Moonwatch line, but it descends from the long Lemania-based Speedmaster chronograph architecture rather than being a clean-sheet movement.
The 310.30.42.50.01.002 uses Omega Calibre 3861, a manual-winding Co-Axial Master Chronometer chronograph movement with 26 jewels, 21,600 vph / 3Hz frequency and approximately 50 hours of power reserve. It is a major upgrade over the previous 1861 generation through Co-Axial escapement, METAS Master Chronometer certification, silicon balance spring and strong magnetic resistance. The honest WatchIntel nuance is that 3861 is an Omega manufacture calibre in the modern Moonwatch line, but it descends from the long Lemania-based Speedmaster chronograph architecture rather than being a clean-sheet movement.
WatchIntel never overclaims "in-house" without source nuance. Manufacturer marketing language may differ.
Technical specifications
About this movement
Omega Calibre 3861 is the current Moonwatch chronograph movement, introduced as the successor to Cal. 1861. It brings Co-Axial escapement technology, silicon balance spring, and Master Chronometer testing to the classic Lemania-derived chronograph architecture that has powered Speedmasters since the 1960s.
Serviceability
Service through Omega authorised centres globally. The Co-Axial escapement can extend lubricant life at the escapement compared with traditional lever designs. Master Chronometer servicing requires factory-trained technicians. Typical interval: 5 to 7 years. Moderate cost by luxury standards.
Best watches using this movement
WatchIntel linked watches
Published references in our database. This list is not complete.
Compared with similar movements
Similar movement comparisons pending editorial review.
Frequently asked questions
What is the Omega Calibre 3861?+
Omega Calibre 3861 is a Omega caliber (Cal. 3861). The 310.30.42.50.01.002 uses Omega Calibre 3861, a manual-winding Co-Axial Master Chronometer chronograph movement with 26 jewels, 21,600 vph / 3Hz frequency and approximately 50 hours of power reserve. It is a major upgrade over the previous 1861 generation through Co-Axial escapement, METAS Master Chronometer certification, silicon balance spring and strong magnetic resistance. The honest WatchIntel nuance is that 3861 is an Omega manufacture calibre in the modern Moonwatch line, but it descends from the long Lemania-based Speedmaster chronograph architecture rather than being a clean-sheet movement.
What is the Omega Calibre 3861 based on?+
The architecture traces to Lemania 1873 / 861 architecture lineage. WatchIntel classifies lineage separately from marketing "in-house" claims.
What are the key specs of the Omega Calibre 3861?+
Core specs: 26 jewels, 50-hour power reserve, manual winding. See the technical specifications table for escapement, certification, and functions.
How easy is it to service the Omega Calibre 3861?+
Service through Omega authorised centres globally. The Co-Axial escapement can extend lubricant life at the escapement compared with traditional lever designs. Master Chronometer servicing requires factory-trained technicians. Typical interval: 5 to 7 years. Moderate cost by luxury standards.
Which watches use the Omega Calibre 3861?+
WatchIntel links 1 published watch to this caliber in our database. Our database is not complete.
WatchIntel is independent. Not affiliated with Omega, Rolex, TAG Heuer, Seiko, Tudor, Hublot or any other watch brand.