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 Vintage Speedmaster Bracelet 1496 (18mm end-links)

Omega Vintage Speedmaster Bracelet 1496 (18mm end-links)

Omega - 1496 $299
Up for sale is my Omega 1496 bracelet with 18mm endlinks (ref#813) that I had on my Speedmaster Reduced, now collecting dust.

  • Condition: good shape for its age
  • End links size: 18mm
Posted at
Dec 20, 2025, 4:06 PM
Active
[WTS] Omega Speedmaster. 39mm. Automatic. $1550 only !!

Omega Speedmaster. 39mm. Automatic. $1550 only !!

Omega - Speedmaster $1,550
This Omega Speedmaster is a 39mm automatic chronograph watch with an AM strap.

  • Condition: Very nice
  • Case Size: 39mm diameter
  • Movement Type: Automatic
Posted at
Dec 20, 2025, 11:54 AM
Active
[WTS] 1991 Omega Speedmaster Moonwatch Ref 3590.50 with abstract

1991 Omega Speedmaster Moonwatch Ref 3590.50 with abstract

Omega - 3590.50 $4,099
A 1991 Omega Speedmaster Moonwatch with a caliber 861 movement and tritium dial and hands, in excellent condition and appearing unpolished.

  • Condition: Excellent, unpolished
  • Movement: Caliber 861
  • Serial number: 482774XX
  • Bracelet size range: fits wrists over 7.5"
Posted at
Dec 19, 2025, 5:59 PM
Active
[WTS] Omega Speedmaster Broad Arrow 321.10.42.50.01.001 2019

Omega Speedmaster Broad Arrow 321.10.42.50.01.001 2019

Omega - 321.10.42.50.01.001 $3,999
This Omega Speedmaster Broad Arrow is a 2019 model with a crisp case and running perfectly, featuring a massive bracelet.

  • Condition: Incredible-condition
  • Dimensions: 42mm diameter
  • Year: 2019
Posted at
Dec 19, 2025, 12:15 PM
Active
[WTS] Omega Speedmaster. Broadarrow. Clean. 馃敟

Omega Speedmaster. Broadarrow. Clean. 馃敟

Omega - Speedmaster $3,550
The Omega Speedmaster is a classic watch with a broadarrow design, featuring strong lume.

  • Condition: Very clean and strong lume
  • Location: NJ USA
Posted at
Dec 19, 2025, 11:00 AM
Active
[WTS] DISCONTINUED OMEGA SPEEDMASTER RACING (Ref. 331.12.42.51.03.001)

DISCONTINUED OMEGA SPEEDMASTER RACING (Ref. 331.12.42.51.03.001)

Omega - 331.12.42.51.03.001 $4,750
This Omega Speedmaster Racing is a discontinued model from 2023 in very good condition and comes with several accessories.

  • Condition: Very good, lightly used
Posted at
Dec 19, 2025, 9:25 AM
Active
[WTS] Omega Speedmaster Quartz LCD

Omega Speedmaster Quartz LCD

Omega $1,400
a quartz-powered watch with an LCD display

Posted at
Dec 18, 2025, 4:55 PM
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[WTS] Omega Speedmaster Professional (Sapphire Sandwich) 310.30.42.50.04.001

Omega Speedmaster Professional (Sapphire Sandwich) 310.30.42.50.04.001

Omega - 310.30.42.50.04.001 $8,200
This Omega Speedmaster Professional 'Sapphire Sandwich' is a highly sought-after model, purchased in 2024 and comes as a complete set with original boxes, warranty cards, and travel case. It's in amazing condition with all functions working normally.

  • Condition: like-new condition, practically zero wear marks
  • Original boxes: true
  • Warranty cards year: 2024
  • Strap type: aftermarket rubber strap
Posted at
Dec 18, 2025, 1:59 PM
Active
[WTS] 2021 Omega Speedmaster Dark Side Of The Moon 44.25mm Black Ceramic - $8,000

2021 Omega Speedmaster Dark Side Of The Moon 44.25mm Black Ceramic - $8,000

Omega - 311.92.44.30.01.001 $8,000
2021 Omega Speedmaster Dark Side Of The Moon Apollo 8 with a 44.25mm black ceramic case, featuring an adjustable leather strap and additional black textile strap.

  • Condition: Excellent overall condition
  • Case size: 44.25mm diameter
  • Warranty: 5 year manufacturer warranty
Posted at
Dec 18, 2025, 1:36 PM
Active