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

Current Listings

Omega Speedmaster Moonwatch 42mm Steel Hesalite 310.30.42.50.01.001 Full Set

Omega - 310.30.42.50.01.001 · $5,480

This Omega Speedmaster Moonwatch features a stainless steel case measuring 42mm in diameter, a black dial with Hesalite crystal, and a stainless steel bracelet.

Condition: Preowned with some scratches on the case, buckle, and crystal
Case dimensions: 42mm diameter
Bezel material: Stainless Steel
Dial color: Black

Posted at

Feb 16, 2026, 8:18 PM

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2021 Omega Speedmaster Moonwatch 42mm Steel Hesalite 310.30.42.50.01.001 Full Set

Omega - 310.30.42.50.01.001 · $5,675

2021 Omega Speedmaster Moonwatch 42mm Steel Hesalite, a manual wind mechanical watch featuring a stainless steel case and black dial.

Condition: Nice Preowned Condition with Some Scratches on the Case and Buckle.
Case material: Stainless Steel
Case dimensions: 42mm diameter
Bezel material: Stainless Steel

Posted at

Feb 16, 2026, 8:14 PM

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[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. $8000 shipped in US. 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. $8000 shipped in US. New Orleans, LA

Omega - 329.30.44.51.06.001 · $8,000

This Omega Speedmaster Racing features a gray dial and is sold with a full kit, including inner, outer and shipping boxes, all three cards, hang tag and factory stainless bracelet with extra link.

Condition: New in box
Country of origin: Switzerland

Posted at

Feb 16, 2026, 6:47 PM

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Omega Speedmaster. Moonphase. Gorgeous Dial. Clean.

Omega - Speedmaster Moonphase · $4,950

This Omega Speedmaster features a 42mm diameter, moonphase display, and blue hands, with very good lume. The watch runs strong and has a very crisp dial.

Condition: Clean, runs strong
Case Size: 42mm

Posted at

Feb 16, 2026, 6:27 PM

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20mm Horus Rubber Straps for Omega Speedmaster & Moonswatch + other brands (Well below retail)

· $49

Horus Rubber Straps for various brands including Omega Speedmaster and Moonswatch, designed to give a fun pop to these watches.

Condition: Like New
Material: Rubber
Colors: Blue Lavender,Light pink,Red,Translucent Lime Green,Sky Blue,Hot Pink
Compatibility: Omega Speedmaster,Moonswatch,Sinn,Zelos Swordfish,Heuer,Seamaster,IWC

Posted at

Feb 16, 2026, 6:10 PM

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Omega Speedmaster Professional Moonwatch Mint

Omega - 31030425001002 · $6,250

This Omega Speedmaster Professional 'Sapphire Sandwich' model features a caliber 3861 and is a full kit including the watch on bracelet, presentation box, cards, and booklet.

Condition: Mint, like new
Caliber: 3861
Shipping: fully insured within continental US

Posted at

Feb 16, 2026, 2:48 PM

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Omega Speedmaster Professional Moonwatch Hesalite, 4/25 full set, Mint, $5800

Omega - 310.32.42.50.01.001 · $5,800

A legendary Omega Speedmaster Professional Moonwatch featuring the Co-Axial Master Chronometer Caliber 3861, purchased new in April 2025 and remaining in mint condition.

Condition: Mint condition, no signs of wear
Case size: 42mm diameter
Water resistance: 50m depth rating
Crystal material: Hesalite

Posted at

Feb 16, 2026, 2:25 PM

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Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001

Omega - 310.30.42.50.01.001 · $5,800

2023 Omega Speedmaster Professional Moonwatch Hesalite in excellent condition, features a 3861 movement keeping excellent time and comes with additional accessories.

Condition: good
Movement: 3861
Crystal type: Hesalite
Bracelet adjustment: 7.3 inch wrist

Posted at

Feb 16, 2026, 12:39 PM

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