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

Reference 310.55.42.50.51.001

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] Omega Speedmaster Reduced 3510.50 - $2500 SHIPPED

Omega Speedmaster Reduced 3510.50 - $2500 SHIPPED

Omega - 3510.50 ยท $2,500
This Omega Speedmaster Reduced features a 39mm case size, automatic 3220 movement, and is very wearable on most wrists.

  • Condition: Good overall condition with light scratches from regular use
  • Case size: 39mm
  • Movement: 3220 automatic
  • Bracelet type: Uncle's flat link
Posted at
May 4, 2026, 7:06 PM
Active
[WTS] Omega Speedmaster Chrono Blue Dial 43mm - 329.30.43.51.03.001 Full Set - Like New Condition - Houston, TX ๐Ÿ”ฅ๐Ÿ’ฐ6,297๐Ÿ’ฐ๐Ÿ”ฅ + ๐Ÿท๏ธ

Omega Speedmaster Chrono Blue Dial 43mm - 329.30.43.51.03.001 Full Set - Like New Condition - Houston, TX ๐Ÿ”ฅ๐Ÿ’ฐ6,297๐Ÿ’ฐ๐Ÿ”ฅ + ๐Ÿท๏ธ

Omega - 329.30.43.51.03.001 ยท $6,297
The Omega Speedmaster Chronoscope is a stylish and functional wristwatch designed for unisex adults, featuring a blue dial with spiral pattern and Arabic numerals, housed in a stainless steel case.

  • Condition: Like new condition, both mechanically and cosmetically.
  • Case size: 43mm
  • Movement type: Mechanical manual
  • Water resistance: 50m
Posted at
May 4, 2026, 6:35 PM
Active
[WTS] Omega Speedmaster OEM Rubber Strap & Deployant Clasp

Omega Speedmaster OEM Rubber Strap & Deployant Clasp

Omega - Speedmaster ยท $500
Up for sale is an Omega Speedmaster's OEM rubber strap and its clasp, in excellent condition. The deployant clasp was not used due to personal preference.

  • Material: rubber
  • Clasp type: deployant
Posted at
May 4, 2026, 3:20 PM
Active
[WTS] Omega. Speedmaster. Reverse Panda. Complete Set. $2099 Only

Omega. Speedmaster. Reverse Panda. Complete Set. $2099 Only

A complete Omega Speedmaster Reverse Panda set, featuring a 39mm case on an OEM bracelet designed for wrists up to 7 inches in circumference.

  • Condition: 7.75/10 with wear around bezel and some flea bites on crystal
  • Bracelet size: 39mm diameter can fit ~7inch wrist with 20 links
  • Box condition: complete
Posted at
May 4, 2026, 2:57 PM
Active
[WTS] Omega Speedmaster Date 3513.50 โ€“ 39mm Automatic Chronograph โ€“ Black Dial โ€“ Full Set Serviced Price : 2350$

Omega Speedmaster Date 3513.50 โ€“ 39mm Automatic Chronograph โ€“ Black Dial โ€“ Full Set Serviced Price : 2350$

Omega - 3513.50 ยท $2,350
This classic Omega Speedmaster Date ref. 3513.50 is a 39mm automatic chronograph with a black dial, part of the less-highly-regarded Speedmaster line. It's perfect for everyday wear with its iconic Speedy DNA.

  • Condition: Very good used condition, minor scratches on case and strap
  • Case size: 39mm diameter
  • Thickness: ~14mm
  • Lug width: 18mm
Posted at
May 4, 2026, 1:18 PM
Active
[WTS] Omega Speedmaster Date 3211.31.00 โ€” 40mm Panda Dial โ€” Cal. 1164 (Fresh Service) โ€” $2,399 Shipped (Tariff Covered)

Omega Speedmaster Date 3211.31.00 โ€” 40mm Panda Dial โ€” Cal. 1164 (Fresh Service) โ€” $2,399 Shipped (Tariff Covered)

Omega - 3211.31.00 ยท $2,399
This Omega Speedmaster Date features a clean silver panda dial with black subdials and red accents, powered by Cal. 1164 with chronograph functions that operate as they should.

  • Condition: Pre-owned with honest wear
  • Case size: 40mm diameter
  • Lug-to-lug length: 46mm
  • Thickness: 15mm
Posted at
May 4, 2026, 1:13 PM
Active
[WTS] Omega Speedmaster Racing - 329.30.44.51.01.001 - Box and Papers - Price Reduced!

Omega Speedmaster Racing - 329.30.44.51.01.001 - Box and Papers - Price Reduced!

Omega - 329.30.44.51.01.001 ยท $5,695
A pre-owned Omega Speedmaster Racing Chronograph in good condition, featuring a 44.25mm size and coming with its original box, papers, and stainless steel bracelet.

  • Condition: pre-owned with minor wear
  • Size: 44.25mm
  • Bracelet material: stainless steel
  • Payment methods: Zelle, bank wire, or PayPal F&F
Posted at
May 4, 2026, 1:11 PM
Active
[WTS] Omega Speedmaster Broad Arrow Ref. 321.10.44.50.01.001

Omega Speedmaster Broad Arrow Ref. 321.10.44.50.01.001

Omega - 321.10.44.50.01.001 ยท $3,600
This Omega Speedmaster Broad Arrow features a 44mm stainless steel case, automatic Co-Axial Caliber 3313 movement, and a textured black dial.

  • Condition: Great condition overall, sapphire crystal clean, textured black dial pristine, stainless steel case shows light wear, automatic movement running good
  • Case Size: 44mm diameter
  • Movement: Automatic Co-Axial Caliber 3313
  • Bracelet Length: fits a 7.5in wrist
Posted at
May 4, 2026, 12:58 PM
Active
[WTS] Omega Speedmaster 145.022-69 Excellent Condition $4,499

Omega Speedmaster 145.022-69 Excellent Condition $4,499

Omega - 145.022-69 ยท $4,499
This is a vintage Omega Speedmaster Professional Moonwatch in excellent condition, featuring a 'stepped' dial and the Caliber 861 movement.

  • Condition: Excellent Condition
  • Case Size: 42mm diameter
  • Case Thickness: 14mm
  • Lug To Lug: 48mm
Posted at
May 4, 2026, 12:55 PM
Active