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

Reference 310.55.42.50.51.001

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

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.
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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] 2023 Omega Speedmaster Moonphase Sedna Gold

2023 Omega Speedmaster Moonphase Sedna Gold

Omega - 304.23.44.52.13.001 · $9,338
2023 Omega Speedmaster Moonphase Sedna Gold, a high-end watch featuring a brown sun-brushed dial and precision moonphase display at 6 o'clock.

  • Condition: Excellent, with light signs of wear
  • Case Size: 44.25mm diameter
  • Case Material: 18k Sedna Gold
  • Dial Color: Brown
Posted at
Feb 9, 2026, 5:25 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster 38 324.30.38.50.01.001 38mm Black Dial B&P

Omega Speedmaster 38 324.30.38.50.01.001 38mm Black Dial B&P

Omega - 324.30.38.50.01.001 · $4,200
Posted at
Feb 9, 2026, 5:01 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Racing 44.25, gray dial full kit, new in box. Inner, outer and shipping boxes, all three cards, hang tag and factory stainless bracelet with extra link. Reference number 329.30.44.51.06.001. New Orleans, LA

Omega Speedmaster Racing 44.25, gray dial full kit, new in box. Inner, outer and shipping boxes, all three cards, hang tag and factory stainless bracelet with extra link. Reference number 329.30.44.51.06.001. New Orleans, LA

Omega - 329.30.44.51.06.001 · $8,000
This Omega Speedmaster Racing features a gray dial and comes with a full kit, including inner and outer boxes, all three cards, hang tag, and factory stainless bracelet with extra link.

  • Condition: New in box
  • Box count: 3
  • Bracelet type: factory stainless
Posted at
Feb 9, 2026, 2:50 PM
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[WTS] Omega Speedmaster “Ed White” Cal. 321 Tropical Dial Heavy Patina (Serviced)

Omega Speedmaster “Ed White” Cal. 321 Tropical Dial Heavy Patina (Serviced)

Omega - 105.003-65 · $9,850
The Omega Speedmaster Ed White Ref. 105.003-65 is a historic watch that holds a special place in Omega's history, being the last straight-lug Speedmaster worn by astronauts during NASA’s Gemini missions. It features a stunning brown tropical dial with rich patina and tritium hands that respond under UV light.

  • Condition: Very good condition, with signs of a previous polish and rich patina on the dial
  • Case size: 39mm
  • Movement service date: July 2025
Posted at
Feb 9, 2026, 12:18 PM
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[WTS] Omega Speedmaster Moonphase 304.33.44.52.03 Blue Dial 44.25mm Full Set

Omega Speedmaster Moonphase 304.33.44.52.03 Blue Dial 44.25mm Full Set

Omega - 304.33.44.52.03 · $7,494
A pre-owned Omega Speedmaster Moonphase featuring a blue dial, moonphase complication, and Co-Axial Master Chronometer automatic movement.

  • Condition: Very good
  • Case size: 44.25mm diameter
  • Movement: Co-Axial Master Chronometer automatic
  • Complications: chronograph and moonphase
Posted at
Feb 9, 2026, 9:53 AM
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[WTS] Omega Speedmaster Professional Sapphire 3861 - Mint Condition

Omega Speedmaster Professional Sapphire 3861 - Mint Condition

Omega - 310.30.42.50.01.002 · $5,900
This Omega Speedmaster Professional Sapphire is a high-end timepiece with a sapphire caseback and new bracelet, featuring excellent condition and including the full box presentation and accessories.

  • Condition: Mint Condition
  • Bracelet: new
  • Case back material: sapphire
Posted at
Feb 9, 2026, 7:09 AM
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[WTS] 3220.50 Omega Speedmaster Day-Date Black Dial 40mm $2,150

3220.50 Omega Speedmaster Day-Date Black Dial 40mm $2,150

Omega - 3220.50 · $2,150
This Omega Speedmaster Day-Date features a black dial and is 40mm in size.

  • Condition: Good condition with little signs of use
  • Wrist size fit: about 18.5cm
  • Service history: recently serviced with excellent timegrapher numbers
  • Polish option: full polish and service can be requested prior to purchase
Posted at
Feb 9, 2026, 1:59 AM
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[WTS] OMEGA Speedmaster "Dark Side of the Moon" Apollo 8 Ref. 311.92.44.30.01.001 + Apollo 8 Gen2 Strap + Deployant Clasp - ULTIMATE SET! 🔥$10,000🔥

OMEGA Speedmaster "Dark Side of the Moon" Apollo 8 Ref. 311.92.44.30.01.001 + Apollo 8 Gen2 Strap + Deployant Clasp - ULTIMATE SET! 🔥$10,000🔥

OMEGA - 311.92.44.30.01.001 · $10,000
The OMEGA Speedmaster Dark Side of the Moon Apollo 8 commemorates the 50th anniversary of the Apollo 8 mission, featuring a black ceramic case and a laser-ablated dial representing the lunar surface.

  • Condition: UNWORN
  • Case diameter: 44.25mm
  • Movement: Calibre 1869
Posted at
Feb 8, 2026, 7:44 PM
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[WTS] OMEGA Speedmaster Calibre 321 "Ed White" Ref. 311.30.40.30.01.001 - ULTIMATE SET! 🔥$17,500🔥

OMEGA Speedmaster Calibre 321 "Ed White" Ref. 311.30.40.30.01.001 - ULTIMATE SET! 🔥$17,500🔥

OMEGA - 311.30.40.30.01.001 · $17,500
A faithful recreation of the Speedmaster Calibre 321, famously worn by astronaut Ed White during America's first spacewalk, featuring a stainless steel case and iconic straight lugs.

  • Condition: UNWORN
  • Case Material: stainless steel
  • Diameter: 39.7mm
  • Movement: Calibre 321 column-wheel chronograph movement
Posted at
Feb 8, 2026, 7:32 PM
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