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

Reference 310.55.42.50.51.001

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.
Buy Now on Jomashop
This is an affiliate link

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
50

Current Listings

[WTS] Omega “Silver Snoopy” Speedmaster

Omega “Silver Snoopy” Speedmaster

Omega - 310.32.42.50.02.001 · $13,999
This commemorative Omega Speedmaster Silver Snoopy Award pays tribute to NASA's 1970 Silver Snoopy Award with a detailed caseback animation of Snoopy in orbit and mission-inspired design.

  • Condition: Brand new, unworn
  • Case Diameter: 42mm
  • Water Resistance: 50m depth rating
  • Movement: Omega Co-Axial Master Chronometer Calibre 3861
Posted at
Jan 24, 2026, 6:21 PM
Active
[WTS] Omega Speedmaster Professional 310.30.42.50.04.001 white dial, 2024 full set

Omega Speedmaster Professional 310.30.42.50.04.001 white dial, 2024 full set

2024 Omega Speedmaster Professional with a white dial and new style bracelet.

  • Condition: Perfect
  • Case size: 42mm
  • Bracelet type: stainless steel with sliding clasp adjustments
Posted at
Jan 24, 2026, 6:00 PM
Active
[WTS] Omega Speedmaster FOIS – Full Set – $4,300 Shipped

Omega Speedmaster FOIS – Full Set – $4,300 Shipped

Omega - Speedmaster FOIS · $4,300
A manual winding Omega Speedmaster from 2017 with a case size of 39.7mm and Hesalite crystal, presented in full set condition including multiple straps and documentation.

  • Condition: Very good overall
  • Case Size: 39.7mm
  • Movement: Manual winding
Posted at
Jan 24, 2026, 2:38 PM
Active
[WTS] 2024 Omega Speedmaster “First Omega in Space” 310.30.40.50.06.001 – Full Set – $6,450 Shipped

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

This is a 2024 Omega Speedmaster 'First Omega in Space' reference featuring a 39.7mm case with straight lugs and a vintage-inspired aesthetic, paired with Omega's Master Chronometer technology.

  • Condition: Excellent
  • Case size: 39.7mm
  • Movement: Omega Caliber 3861, Master Chronometer manual-wind chronograph
  • Water resistance: 50m
Posted at
Jan 24, 2026, 1:20 PM
Active
[WTS] Omega Speedmaster Michael Schumacher The Legend Collection $3,450

Omega Speedmaster Michael Schumacher The Legend Collection $3,450

The Omega Speedmaster Michael Schumacher The Legend Collection is a limited edition watch celebrating motorsport and the achievements of Michael Schumacher, featuring a checkered carbon fiber dial and various racing-related details.

  • Condition: great pre-owned condition
  • Case Size: 44mm
  • Lug Width: 21mm
  • Water Resistance: 100m
Posted at
Jan 24, 2026, 11:31 AM
Active
[WTS] Omega Speedmaster. 39mm. White Ceramic. Very nice.

Omega Speedmaster. 39mm. White Ceramic. Very nice.

Omega · $3,100
A 39mm white ceramic Omega Speedmaster with strong lume.

  • Case size: 39mm diameter
  • Material: white ceramic
Posted at
Jan 24, 2026, 10:54 AM
Active
[WTS] Omega Speedmaster Dark Side of the Moon "Vintage"

Omega Speedmaster Dark Side of the Moon "Vintage"

This Omega Speedmaster Dark Side of the Moon 'Vintage' edition is a rare model that no longer exists in production, featuring a black ceramic case and weighing 99 grams with a diameter of 44mm.

  • Condition: nearly perfect
  • Case diameter: 44mm
  • Lug-to-lug measurement: 49mm
  • Weight: 99 grams
Posted at
Jan 24, 2026, 8:56 AM
Active
[WTS] 2025 Omega Speedmaster White Dial 42 - $6,799

2025 Omega Speedmaster White Dial 42 - $6,799

Omega - Speedmaster · $6,799
This is a modern take on the iconic Speedmaster design featuring a crisp white dial, black tachymeter bezel, and classic chronograph layout. It wears exceptionally well on the wrist and delivers the timeless Speedmaster look with everyday versatility.

  • Condition: great overall condition
  • Year: 2025
  • Dial color: white
  • Bezel type: black tachymeter
Posted at
Jan 23, 2026, 11:04 PM
Active
[WTS] 2025 Omega Speedmaster DSOTM Black Black

2025 Omega Speedmaster DSOTM Black Black

2025 Omega Speedmaster DSOTM Black Black, a completely blacked out variant of the Speedmaster platform, crafted from solid ceramic with polished and brushed case, exhibition caseback, and a deployant clasp. This model is now discontinued.

  • Condition: like new condition
  • Case Size: 44.25mm
  • Movement: Omega Cal 9300 Automatic
  • Power Reserve: 60hrs
Posted at
Jan 23, 2026, 10:15 PM
Active