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

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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OMEGA Speedmaster Date 40mm Full Kit 18k Gold/Steel

OMEGA - 323.21.40.40.02.001 · $3,600

Up for sale is a Omega Speedmaster Date 40mm Steel/Yellow Gold Ref. 323.21.40.40.02.001, This is a full kit.

Case Size: 40mm
Materials: Steel/18k Yellow Gold

Posted at

Feb 16, 2026, 10:39 AM

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Omega Speedmaster Moonphase 304.33.44.52.03 Blue Dial 44.25mm Full Set

Omega - 304.33.44.52.03 · $7,494

The Omega Speedmaster Moonphase features a blue dial, moonphase complication at 6 o'clock, and Co-Axial Master Chronometer automatic movement.

Condition: Very good
Case size: 44.25 mm
Movement type: Co-Axial Master Chronometer automatic

Posted at

Feb 16, 2026, 9:59 AM

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Omega Speedmaster FOIS Numbered Edition 311.32.40.30.01.001 w/ Ed White Mods [USA-TN]

Omega - 311.32.40.30.01.001 · $3,500

This 2014 Omega Speedmaster FOIS features a numbered edition, manual winding movement, and ultra-wearable dimensions of 39.7mm x 19 x 47. The watch has been modified with OEM Speedmaster Professional Moonwatch hands and given a professional patina treatment to give it a vintage aesthetic.

Condition: excellent overall condition with honest light wear
Movement type: manual winding 1861 movement
Water resistance: unknown
Dimensions: 39.7mm x 19 x 47

Posted at

Feb 15, 2026, 6:04 PM

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Omega Speedmaster Broad Arrow 1957 321.10.42.50.01.001 Full Set

Omega - 321.10.42.50.01.001 · $4,100

A modern tribute to the legendary original Speedmaster design, this Omega Speedmaster Broad Arrow 1957 features a black dial and classic Speedmaster styling with a modern 42 mm case for everyday wearability.

Condition: Excellent
Case size: 42 mm diameter
Set: Full set (watch, box, papers, and accessories as originally supplied)

Posted at

Feb 15, 2026, 4:21 PM

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