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

2024 Omega Speedmaster "Blue Side of the Moon" BSOM Aventurine Dial - 304.93.44.52.03.002 Box and Papers

Omega - 304.93.44.52.03.002 · $11,249

This Omega Speedmaster Moonphase features a blue ceramic case and bezel, paired with a deep blue aventurine dial that sparkles beautifully under the light.

Condition: Excellent, minimal wear
Case size: 44.25mm diameter
Movement: Co-Axial Master Chronometer Caliber 9904

Posted at

Mar 20, 2026, 11:10 AM

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Omega Speedmaster Reduced - White Mother of Pearl w/ Light Blue Numerals - STUNNING - $2,499 Shipped!

Omega - Speedmaster Reduced · $2,499

This Omega Speedmaster Reduced features a white mother of pearl dial with light blue numerals, making it a stunning timepiece.

Dial color: White Mother of Pearl w/ Light Blue numerals

Posted at

Mar 20, 2026, 8:39 AM

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Omega Speedmaster Moonwatch Professional - White Dial - 310.30.42.50.04.001 - Full Set

Omega - 310.30.42.50.04.001 · $8,100

This Omega Speedmaster Moonwatch Professional features a white dial and is a full set, including watch, box, historical booklet, user manual, microfiber cloth, master chronometer card, and warranty card.

Condition: pristine condition with minor hairlines

Posted at

Mar 20, 2026, 8:08 AM

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Omega Speedmaster MK40

Omega - 3820.53 · $3,000

a fun watch with tritium lume that has aged to a perfect pumpkin hue, made famous by Ben Clymer and Schumacher.

Condition: Great condition
Case Size: 38.5mm diameter
Lug Width: 18mm
Lug To Lug: 45mm length

Posted at

Mar 19, 2026, 11:24 PM

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2025 Omega Speedmaster Calibre 321 "Ed White" - 311.30.40.30.01.001 - $15,100 shipped

Omega - 311.30.40.30.01.001 · $15,100

This is a 2025 Omega Speedmaster Calibre 321 “Ed White” in excellent condition, featuring the iconic manual-wind chronograph movement and coming with its original box, papers, and accessories.

Condition: Very Excellent pre-owned condition
Case size: 39.7mm diameter
Case material: Stainless steel
Movement: Omega Caliber 321 (manual-wind chronograph)

Posted at

Mar 19, 2026, 11:00 PM

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Omega Speedmaster Reduced “MOP” Chronograph on Alligator StrapRef. 3834.78.38 – Full Set – 2012

Omega - 3834.78.38 · $4,150

A more refined take on the Speedmaster, combining sporty chronograph functionality with a dressier look, powered by Omega automatic Caliber 3220.

Condition: Excellent overall with light hairlines from normal wear.
Case size: 39mm
Movement: Omega automatic Caliber 3220
Crystal material: Sapphire crystal

Posted at

Mar 19, 2026, 10:55 PM

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Omega Speedmaster Pro White Dial on Flat Link Bracelet

Omega - 310.30.42.50.04.001 · $7,300

Selling an Omega Speedy Pro White Dial on the OEM Speedmaster '57 flat link bracelet, which honors the look from the original Speedmaster from 1957.

Bracelet type: flat link
Bracelet origin: Omega Boutique at South Coast Plaza in Costa Mesa, CA
Snail trails: present on clasp

Posted at

Mar 19, 2026, 7:51 PM

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Omega Speedmaster Mark II. 327.10.43.50.01.001.

Omega - 327.10.43.50.01.001 · $3,295

This Omega Speedmaster Mark II is a large watch that fits well on the wrist.

Condition: Very good condition
Case Size: 40mm
Shipping Location: NJ USA

Posted at

Mar 19, 2026, 4:54 PM

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Omega Speedmaster Reduced 3510.50 – 2011 Full Set – Serviced – $2,895

Omega - 3510.50 · $2,895

A 2011 Omega Speedmaster Reduced in excellent condition, featuring a black dial and automatic chronograph movement. The watch comes with inner & outer boxes, warranty card, and manuals.

Condition: Excellent / near mint condition
Case size: 39mm
Movement: Omega automatic chronograph (Cal. 3220 / 1140 base)

Posted at

Mar 19, 2026, 4:06 PM

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