Omega Speedmaster Speedmaster Professional Moonwatch 3861 Sedna Gold - Ruby / Black - Ruby / Bracelet

Reference 310.55.42.50.51.001

Omega Speedmaster Professional Moonwatch 3861 Sedna Gold - Ruby / Black - Ruby / Bracelet

About this watch

The Omega Speedmaster Professional Moonwatch 3861 Sedna Gold is a stunning blend of luxury and functionality, with its Sedna gold construction and intricate chronograph features. The watch's sheer elegance is undeniable, with a black sunburst finish contrasting beautifully with gem-set indexes and ruby accents. Certified as a Master Chronometer by METAS, the Omega caliber 3861 movement is an engineering marvel, resistant to magnetic fields up to 15,000 gauss. With small seconds, hours, and minutes hands, the chronograph functionality offers precision timing. The watch's durability is also noteworthy, with sapphire glass adding scratch resistance. The Sedna gold bracelet ensures a secure fit, while its adjustability makes it comfortable for wearers of all wrist sizes. This timepiece is not just a luxury item but a conversation starter, status symbol, and piece of horological history.

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Key Features

Omega caliber 3861 movement with Co-Axial escapement and silicon balance spring
Sedna gold construction with gem-set indexes and ruby accents
50m water resistance with sapphire glass scratch resistance
Chronograph functionality with small seconds, hours, and minutes hands
Adjustable Sedna gold bracelet for secure fit on all wrist sizes

Specifications

Brand

Omega

Family

Speedmaster

Model

Speedmaster Professional Moonwatch 3861 Sedna Gold - Ruby / Black - Ruby / Bracelet

Reference

310.55.42.50.51.001

Movement

3861

Movement Features

Small Seconds, Hours, Minutes
Chronograph
Chronometer

Case

Sedna Gold 42mm

Dial Color

Black

Crystal

Sapphire

Water Resistance

Current Listings

Omega Speedmaster “Ed White” Cal. 321 Tropical Dial Heavy Patina (Serviced)

Omega - 105.003-65 · $10,995

This Omega Speedmaster 'Ed White' features a stunning brown tropical dial and is one of the most collectible variants among Speedmaster enthusiasts, having been worn by astronauts during NASA's Gemini missions. The movement has been professionally serviced in July 2025, ensuring accurate timekeeping with chronograph functions performing as intended.

Condition: Very good condition
Size: 39mm diameter
Year: 1965
Movement serviced: July 2023

Posted at

Jan 15, 2026, 5:27 PM

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Omega Speedmaster Reduced - 39mm Two Tone - Ref 175.0033 - Price Reduced!

Omega - 175.0033 · $2,795

This Omega Speedmaster Reduced features a white dial and is available for sale as watch only on a high-quality leather strap.

Condition: great vintage condition, light hairlines on bezel and case
Case size: 39mm
Strap material: leather AM strap from Casanova

Posted at

Jan 15, 2026, 12:33 PM

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2021 Omega Speedmaster Professional Moonwatch Sapphire Sandwich $5,999

Omega - 310.30.42.50.01.002 · $5,999

The Omega Speedmaster Moonwatch Professional sapphire sandwich version features a robust and elegant 42mm stainless steel case, updated Caliber 3861 movement, and superior magnetic resistance.

Condition: Excellent time keeping with no significant gain or loss
Case size: 42mm diameter
Case thickness: 13.2mm
Lug width: 20mm

Posted at

Jan 15, 2026, 12:27 PM

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Omega Speedmaster Professional Full Kit with Extras (reposted and reduced)

Omega - 3861 · $5,600

an Omega Speedmaster Professional Moonwatch with Cal. 3861 movement and Hesalite crystal, purchased from an Authorized Dealer.

Condition: Daily wear, shows normal wear/use
Movement: Cal. 3861 (Master Chronometer)
Bracelet type: Current bracelet with tool-less sliding clasp adjustment

Posted at

Jan 15, 2026, 10:55 AM

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Omega Speedmaster Reduced 3523.80.00 – Blue Dial – Full Set + Serialized Tag – Mint – $3,500

Omega - 3523.80.00 · $3,500

This Omega Speedmaster Reduced features a unique blue dial, classic proportions and wearability, making it an excellent alternative for collectors who want something rarer than the standard black-dial Reduced.

Condition: Mint
Movement: Automatic chronograph
Case size: 39mm diameter
Dial color: Blue

Posted at

Jan 15, 2026, 10:34 AM

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2023 Omega Speedmaster Calibre 321 “Ed White” 311.30.40.30.01.001 — Excellent Condition, Box & Papers

Omega - 311.30.40.30.01.001 · $75,000

This is a 2023 Omega Speedmaster Calibre 321 'Ed White' edition. It features a silver dial with a distinctive design.

Condition: Excellent Condition
Year: 2023
Movement: Calibre 321

Posted at

Jan 15, 2026, 8:21 AM

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2024 Omega Speedmaster “First Omega in Space” 310.30.40.50.06.001 – Full Set – $6,450 Shipped

Omega - 310.30.40.50.06.001 · $6,450

A modern reissue of the Speedmaster worn by Wally Schirra during the Sigma 7 mission, featuring a slim 39.7mm case with Master Chronometer technology.

Condition: Excellent
Case Size: 39.7mm
Water Resistance: 50m
Movement: Manual-wind chronograph (Omega Caliber 3861, Master Chronometer)

Posted at

Jan 14, 2026, 3:28 PM

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