Omega Speedmaster Speedmaster Professional Moonwatch 3861 Sedna Gold - Diamond / Brown / Bracelet

Reference 310.55.42.50.13.001

About this watch

The Omega Speedmaster Professional Moonwatch 3861 Sedna Gold - Diamond / Brown / Bracelet is a masterpiece of horology, blending art, history, and cutting-edge technology. Crafted from Sedna Gold, this watch boasts a unique color that's both warm and striking. Its round shape and sunburst brown finish give it a luxurious feel, while the diamond-set bezel adds a touch of elegance. The 3861 is equipped with a chronograph feature, allowing you to measure elapsed time with precision. At its heart lies the Omega caliber 3861, an updated version of the legendary caliber 861/1861, featuring a co-axial escapement and silicon balance spring for accuracy and reliability. Master Chronometer certified by METAS, this watch has undergone rigorous testing to withstand magnetic fields of up to 15,000 gauss. Its sleek design and exceptional craftsmanship make it a standout in any collection. Whether you're at a formal event or a casual outing, this watch is sure to turn heads.
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Key Features

  • Sedna Gold case
  • Manual-winding chronograph movement
  • Co-axial escapement and silicon balance spring
  • Master Chronometer certified by METAS
  • Diamond-set bezel
  • Water resistance up to 50 meters
  • 42.00 mm diameter and 13.18 mm height

Specifications

Brand
Omega
Family
Speedmaster
Model
Speedmaster Professional Moonwatch 3861 Sedna Gold - Diamond / Brown / Bracelet
Reference
310.55.42.50.13.001
Movement
3861
Movement Features
  • Small Seconds, Hours, Minutes
  • Chronograph
  • Chronometer
Case
Sedna Gold 42mm
Dial Color
Brown
Crystal
Sapphire
Water Resistance
50

Current Listings

[WTS] 2021 Omega Speedmaster Professional Sapphire Sandwich

2021 Omega Speedmaster Professional Sapphire Sandwich

A 2021 Omega Speedmaster Professional 'Sapphire Sandwich' in excellent condition, featuring a 42mm steel case with a sapphire back and manual winding movement.

  • Condition: Pre-owned, cosmetic condition: 8/10
  • Movement: OMG Calibre 3861 (manual winding)
  • Power reserve: approximately 50 hours
  • Case material: Steel front, sapphire back
Posted at
Dec 16, 2025, 11:13 PM
Active
[wts] 🔥🔥 Omega Speedmaster Professional “Moonwatch”🔥🔥 Priced to sell!!

🔥🔥 Omega Speedmaster Professional “Moonwatch”🔥🔥 Priced to sell!!

Omega - 3570.5 · $3,500
This Omega Speedmaster Professional “Moonwatch” is one of the seller's favorite watches, featuring a 42mm case and reference number 3570.5.

  • Condition: Minimal wear throughout, may contain marks on crystal under heavy magnification
  • Case size: 42mm diameter
Posted at
Dec 16, 2025, 9:53 PM
Active
[WTS] 2014 Omega Speedmaster 57

2014 Omega Speedmaster 57

Omega - Speedmaster 57 · $3,950
This Omega Speedmaster 57 features a 41.5mm automatic movement, caliber 9300.

  • Movement: caliber 9300 (column wheel vertical clutch)
  • Case size: 41.5mm
Posted at
Dec 16, 2025, 9:35 PM
Active
[WTS] Lowered Price: Omega Speedmaster Moonwatch Moonshine Gold with Green Dial

Lowered Price: Omega Speedmaster Moonwatch Moonshine Gold with Green Dial

Omega - 310.60.42.50.10.001 · $30,000
The Omega Speedmaster Moonwatch Moonshine Gold features a 42mm case in Moonshine gold with a green dial and is powered by the hand-wound Master Chronometer caliber 3861. It includes a sapphire crystal front and caseback, chronograph function, and Sedna gold bracelet.

  • Condition: Excellent, barely worn
  • Bracelet material: Sedna gold
  • Bracelet style: Folding clasp
  • Movement: Hand-wound Master Chronometer Caliber 3861
Posted at
Dec 16, 2025, 7:44 PM
Active
[WTS] OMEGA Speedmaster Moonwatch Professional White Dial Stainless Steel Watch 42mm - 310.30.42.50.04.001

OMEGA Speedmaster Moonwatch Professional White Dial Stainless Steel Watch 42mm - 310.30.42.50.04.001

This Omega Speedmaster Moonwatch Professional features a white dial and is powered by the manual wind Caliber 3861 movement.

  • Condition: good condition, shows some signs of wear
  • Movement: Caliber 3861 (manual wind)
  • Case size: 42mm diameter
  • Crystal: sapphire
Posted at
Dec 16, 2025, 6:17 PM
Active
[WTS] Omega Speedmaster Triple Date

Omega Speedmaster Triple Date

This Omega Speedmaster Triple Date is a complete timepiece with some minor missing items. It features an additional set of links, which adds convenience for wearers.

  • Condition: good shape
  • Cards included: full set minus one card
Posted at
Dec 16, 2025, 6:04 PM
Active
[WTS] Omega Speedmaster Date Casino | 3210.52 | 40mm

Omega Speedmaster Date Casino | 3210.52 | 40mm

Omega - 3210.52 · $2,499
This Omega Speedmaster is a 40mm watch with a 7.5" bracelet.

  • Case size: 40mm
  • Bracelet length: 7.5"
  • Payment methods: Zelle, Venmo, Western Union
Posted at
Dec 16, 2025, 4:40 PM
Active
[WTS] Omega Speedmaster white dial full kit $7450 shipped

Omega Speedmaster white dial full kit $7450 shipped

Omega - Speedmaster · $7,450
A pre-owned Omega Speedmaster with a white dial, available for purchase. The watch comes with additional links and is dated from 2024.

  • Condition: Good condition with light swirls on high polished areas
Posted at
Dec 16, 2025, 4:14 PM
Active
[WTS] (Omega) Speedmaster Reduced 3510.50

(Omega) Speedmaster Reduced 3510.50

Omega - 3510.50 · $2,600
For sale is a 1998 Omega Speedmaster Reduced with very good external condition and internally running well.

  • Condition: very good external condition, running well internally
  • Year: 1998
Posted at
Dec 16, 2025, 3:07 PM
Active