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] Omega Speedmaster BSOM Moonphase 304.93.44.52.03.002 (2021) | Complete Box & Papers | $10,999 Shipped

Omega Speedmaster BSOM Moonphase 304.93.44.52.03.002 (2021) | Complete Box & Papers | $10,999 Shipped

Omega - 304.93.44.52.03.002 · $10,999
The Omega Speedmaster “Blue Side of the Moon” (2021) is a stunning and underrated modern Speedmaster variant, crafted entirely from blue ceramic with a rich blue dial and Sedna gold accents.

  • Condition: amazing condition overall
  • Year: 2021
  • Material: blue ceramic
  • Movement: running strong and keeps excellent time
Posted at
Oct 18, 2025, 10:41 PM
Active
[WTS] Omega Speedmaster Moonphase

Omega Speedmaster Moonphase

Omega - 3575.20 · $5,250
Up for sale is an Omega Speedmaster Moonphase ref. 3575.20, which runs great and comes with full kit and documentation.

  • Condition: excellent
  • Warranty card included: true
  • Shipping limited to conus: true
Posted at
Oct 18, 2025, 10:24 PM
Active
[WTS] Omega Speedmaster Professional Moonwatch 310.30.42.50.01.002 – Full Kit – Excellent Condition – $5,900

Omega Speedmaster Professional Moonwatch 310.30.42.50.01.002 – Full Kit – Excellent Condition – $5,900

This Omega Speedmaster Professional Moonwatch is a highly sought-after model, known for its robust design and iconic status.

  • Condition: Excellent Condition
  • Movement: Automatic movement
Posted at
Oct 18, 2025, 10:53 AM
Active
[wts] Omega Speedmaster racing 9900 44.25mm 329.33.44.51.01.001 under warranty

Omega Speedmaster racing 9900 44.25mm 329.33.44.51.01.001 under warranty

This is a Omega Speedmaster racing watch, model 9900, featuring a 44.25mm case size and a factory warranty until OCT 2024.

  • Condition: Good condition
  • Case size: 44.25mm
  • Warranty: Factory warranty until OCT 2024
Posted at
Oct 17, 2025, 9:19 PM
Active
[WTS] Pristine Omega Speedmaster Sapphire Sandwich - Full Set!

Pristine Omega Speedmaster Sapphire Sandwich - Full Set!

A timeless and instantly recognizable watch, meticulously cared for by the seller over two years.

  • Condition: Pristine
  • Worn: 10-12 times over two years
  • Crystal condition: Perfect
  • Bezel condition: Perfect
Posted at
Oct 17, 2025, 8:27 PM
Active
[WTS] Omega Speedmaster 3590.50

Omega Speedmaster 3590.50

  • Title: [WTS] Omega Speedmaster 3590.50
Posted at
Oct 17, 2025, 5:28 PM
Active
[WTS] Omega 1861 Speedmaster Bracelet and Forstner Flatlink Contemporary

Omega 1861 Speedmaster Bracelet and Forstner Flatlink Contemporary

A Omega 1861 Speedmaster, sold with a Forstner bracelet and an additional Forstner Flatlink Contemporary. The first has some wear on the clasp and links, while the second is in excellent condition.

  • Condition: Forstner bracelet (worn) - Speedmaster bracelet (excellent)
  • Shipping Cost Uk: 10
  • Shipping Cost International: 25
Posted at
Oct 17, 2025, 4:05 PM
Active
[WTS] New & Unworn 2025 Omega Speedmaster Professional Moonwatch ‘Silver Snoopy Award’ 50th 310.32.42.50.02.001 Complete

New & Unworn 2025 Omega Speedmaster Professional Moonwatch ‘Silver Snoopy Award’ 50th 310.32.42.50.02.001 Complete

Omega - 310.32.42.50.02.001 · $15,950
The Omega Speedmaster Professional Moonwatch 'Silver Snoopy Award' is a limited edition watch celebrating the 50th anniversary of Omega's recognition from NASA astronauts for its role in the Apollo 13 mission. It features an animated caseback with a mesmerizing display of Snoopy piloting his Command and Service Module in lunar orbit.

  • Condition: Brand New
  • Year: 2025
  • Contents: Complete Collector Set with all the goodies
Posted at
Oct 17, 2025, 12:00 PM
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[WTS] 2024 Omega Speedmaster Professional Moonwatch Sapphire 310.30.42.50.01.002 Full Set

2024 Omega Speedmaster Professional Moonwatch Sapphire 310.30.42.50.01.002 Full Set

2024 Omega Speedmaster Professional Moonwatch with stainless steel case, black bezel, and black dial.

  • Condition: Very nice preowned condition
  • Case material: stainless steel
  • Case dimensions: 42mm diameter
  • Bezel material: stainless steel
Posted at
Oct 16, 2025, 10:02 PM
Active