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

Reference 310.55.42.50.13.001

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

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] 2025 OMEGA SPEEDMASTER WHITE DIAL, LIKE NEW FULL SET $7,350 USD + shipping

2025 OMEGA SPEEDMASTER WHITE DIAL, LIKE NEW FULL SET $7,350 USD + shipping

OMEGA - 2025 · $7,350
The Omega Speedmaster White Dial 2025 features a clean white dial, sapphire crystal, and classic stainless steel case and bracelet.

  • Condition: Like new
  • Year: 2025
  • Case material: stainless steel
  • Bracelet material: stainless steel
Posted at
Nov 30, 2025, 6:11 PM
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[WTS] Omega Speedmaster Professional Moonwatch Tropical Brown Dial Heavy Patina Blue Insert 1969 (Serviced) 🟤

Omega Speedmaster Professional Moonwatch Tropical Brown Dial Heavy Patina Blue Insert 1969 (Serviced) 🟤

Omega - 145.022-69 · $15,150
This is a 1969 Omega Speedmaster Moonwatch with a tropical brown dial featuring a deep, even transformation with heavy yellow patina across all indices and matching hands. The watch has been professionally serviced and runs properly.

  • Condition: Beautiful condition
  • Size: 42mm diameter
  • Year: 1969
  • Case back: Flat case back
Posted at
Nov 30, 2025, 4:23 PM
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[WTS] 1991 Omega Speedmaster Moonwatch Ref 3590.50 with abstract

1991 Omega Speedmaster Moonwatch Ref 3590.50 with abstract

Omega - 3590.50 · $4,199
This is a 1991 Omega Speedmaster Moonwatch with a caliber 861 movement and excellent tritium dial. The watch appears to be in great condition with original hands and an original Omega hesalite crystal.

  • Condition: Excellent vintage condition
  • Movement: Caliber 861
  • Serial number: 482774XX
  • Bracelet size: adjusts to fit up to 7.5 inch wrist
Posted at
Nov 30, 2025, 3:32 PM
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[WTS] Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 – Unworn, FULL SET – $5,900 (Shipped CONUS)

Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 – Unworn, FULL SET – $5,900 (Shipped CONUS)

Omega - 310.30.42.50.01.001 · $5,900
This is an Omega Speedmaster Professional Moonwatch with a manual-wind Master Chronometer movement and legendary 'Moonwatch' design in a 42mm stainless steel case.

  • Condition: Unworn, excellent condition
  • Movement type: Manual-wind
  • Case material: 42mm stainless steel
  • Bracelet included: Yes, original bracelet with all links
Posted at
Nov 30, 2025, 3:21 PM
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[WTS] Omega Speedmaster First Omega in Space (FOIS) Numbered Edition

Omega Speedmaster First Omega in Space (FOIS) Numbered Edition

Omega - 311.32.40.30.01.001 · $4,600
This Omega Speedmaster First Omega in Space has been modified to resemble the Ed White Speedmaster and comes with all original parts for easy conversion. It's a numbered edition from 2020, featuring a genuine Omega 321 handset, Broad Arrow dial, and spiral winder sapphire case back.

  • Condition: Very good condition, with minimal signs of wear.
  • Handset type: Genuine Omega 321
  • Dial type: Genuine Omega 'Broad Arrow'
  • Case back material: Sapphire
Posted at
Nov 30, 2025, 2:25 PM
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[WTS] Forstner Model O for Omega Speedmaster Professional- $100 Shipped

Forstner Model O for Omega Speedmaster Professional- $100 Shipped

· $100
A 20mm Forstner Model O bracelet is available for the Omega Speedmaster. It features excellent build quality and a great taper from 20 mm to 16 mm at the clasp, with a spring-link providing comfortable wrist expansion.

  • Compatible models: 1861 and earlier
  • Dimensions: 20mm diameter (clasp 16mm)
  • Taper: from 20 mm to 16 mm at the clasp
Posted at
Nov 30, 2025, 2:04 PM
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[WTS] 2014 Omega Speedmaster 57 w/Cards (no box)

2014 Omega Speedmaster 57 w/Cards (no box)

Omega - Speedmaster 57 · $3,950
A 2014 Omega Speedmaster 57 with a 41.5mm automatic movement and column wheel vertical clutch.

  • Movement: caliber 9300
  • Strap type: NATO
Posted at
Nov 30, 2025, 12:38 PM
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[WTS] Omega Speedmaster. 39mm. Automatic.

Omega Speedmaster. 39mm. Automatic.

Omega - Speedmaster · $1,575
A 39mm automatic Omega Speedmaster with strong lume, being sold by the seller.

  • Case Size: 39mm diameter
  • Movement Type: Automatic
Posted at
Nov 30, 2025, 12:20 PM
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[WTS] Omega Moon Landing 50th Anniversary – Apollo Astronaut Gold Figure USB + Speedmaster Pin (Netherlands)

Omega Moon Landing 50th Anniversary – Apollo Astronaut Gold Figure USB + Speedmaster Pin (Netherlands)

Omega · $2,500
The Omega Moon Landing 50th Anniversary collection includes a rare astronaut gold figure USB and a Speedmaster pin, given out during Omega's promotions for the anniversary.

  • Condition: Excellent condition
  • Country of origin: Netherlands
  • Eu/international shipping: true
Posted at
Nov 30, 2025, 11:03 AM
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