Omega Speedmaster Speedmaster Professional Moonwatch 3861 Sedna Gold - Diamond / Brown / Bracelet

Reference 310.55.42.50.13.001

About this watch

The Omega Speedmaster Professional Moonwatch 3861 Sedna Gold - Diamond / Brown / Bracelet is a masterpiece of horology, blending art, history, and cutting-edge technology. Crafted from Sedna Gold, this watch boasts a unique color that's both warm and striking. Its round shape and sunburst brown finish give it a luxurious feel, while the diamond-set bezel adds a touch of elegance. The 3861 is equipped with a chronograph feature, allowing you to measure elapsed time with precision. At its heart lies the Omega caliber 3861, an updated version of the legendary caliber 861/1861, featuring a co-axial escapement and silicon balance spring for accuracy and reliability. Master Chronometer certified by METAS, this watch has undergone rigorous testing to withstand magnetic fields of up to 15,000 gauss. Its sleek design and exceptional craftsmanship make it a standout in any collection. Whether you're at a formal event or a casual outing, this watch is sure to turn heads.

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Key Features

Sedna Gold case
Manual-winding chronograph movement
Co-axial escapement and silicon balance spring
Master Chronometer certified by METAS
Diamond-set bezel
Water resistance up to 50 meters
42.00 mm diameter and 13.18 mm height

Specifications

Brand

Omega

Family

Speedmaster

Model

Speedmaster Professional Moonwatch 3861 Sedna Gold - Diamond / Brown / Bracelet

Reference

310.55.42.50.13.001

Movement

3861

Movement Features

Small Seconds, Hours, Minutes
Chronograph
Chronometer

Case

Sedna Gold 42mm

Dial Color

Brown

Crystal

Sapphire

Water Resistance

Current Listings

12/2025 Omega Speedmaster Moonwatch Professional Sapphire 310.30.42.50.01.002 – Full Set + Extras – Excellent Condition – $6,900 Shipped

Omega - 310.30.42.50.01.002 · $6,900

This Omega Speedmaster Moonwatch Professional Sapphire features a sapphire crystal, Master Chronometer caliber 3861 movement and classic design.

Condition: Excellent (light hairlines on caseback only)
Case size: 42mm
Movement: Manual-wind chronograph (Omega Caliber 3861)
Crystal material: Sapphire

Posted at

Jan 23, 2026, 3:22 PM

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2025 Omega Speedmaster Moonwatch Professional 310.30.42.50.04.001 – Full Set – Like New – $7,650 Shipped

Omega - 310.30.42.50.04.001 · $7,650

A modern Omega Speedmaster Moonwatch Professional featuring a white lacquer dial and powered by the Master Chronometer caliber 3861, delivering exceptional accuracy and anti-magnetism.

Condition: Like new
Case Size: 42mm
Movement: Manual-wind chronograph (Omega Caliber 3861)
Water Resistance: 50m

Posted at

Jan 23, 2026, 2:59 PM

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Omega "Silver Snoopy" Speedmaster 2025

Omega - 310.32.42.50.02.001 · $15,499

This is a commemorative edition of the Omega Speedmaster Silver Snoopy Award, presented in brand new condition to honor Omega's role in the safe return of Apollo 13.

Condition: Brand new, unworn
Case size: 42 mm
Material: stainless steel
Movement: Omega Co-Axial Master Chronometer Calibre 3861

Posted at

Jan 23, 2026, 2:03 PM

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

Omega - 105.003-65 · $9,850

This Omega Speedmaster Ed White Ref. 105.003-65 is a highly collectible variant with a stunning brown tropical dial, developed rich patina over time, and matching tritium hands that respond under UV light.

Condition: Very good condition, with signs of a previous polish
Size: 39mm
Year: 1965
Movement serviced: yes

Posted at

Jan 23, 2026, 12:45 PM

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NEW 2026 Omega Speedmaster Moonwatch Pro 42mm 310.30.42.50.01.002 Black Dial - $7,500

Omega - 310.30.42.50.01.002 · $7,500

A brand new, unworn Omega Speedmaster Moonwatch Professional in stainless steel with a black dial.

Condition: Brand new/unworn
Material: Stainless Steel
Size (diameter): 42mm
Case size (with links): 8.25in

Posted at

Jan 23, 2026, 11:20 AM

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Omega Speedmaster Moonwatch Professional 42mm White Dial 310.30.42.50.04.001 Complete

Omega - 310.30.42.50.04.001 · $7,650

This Omega Speedmaster Moonwatch Professional features a 42mm white dial.

Condition: In very good condition, rated at 9.7/10
Box And Papers: true
Links: removed links included
Warranty: dated 2024

Posted at

Jan 23, 2026, 10:09 AM

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Omega Speedmaster 38 Co-Axial Chronograph Grey Dial 324.32.38.50.06.001

Omega - 324.32.38.50.06.001 · $4,550

Omega Speedmaster 38 Co-Axial Chronograph with a grey dial for sale.

Condition: In very good condition, rated at 9.8/10
Included Items: inner & outer Omega boxes, manual, microfibre cloth, hang tag, caseback sticker, pictogram card, and warranty card
Trades Welcome: true

Posted at

Jan 23, 2026, 9:59 AM

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Omega Speedmaster Blue Side of the Moon Aventurine Moonphase - Full Set + Aaron Bespoke Strap, Mint!

Omega - 304.93.44.52.03.002 · $10,500

This Omega Speedmaster Blue Side of the Moon Aventurine Moonphase features a blue ceramic case, aventurine dial, rose gold hands and indices, tachymeter scale, moonphase display, and an Omega 9904 caliber with METAS certification.

Condition: Mint
Case size: 44.25mm
Lug to lug: just under 50mm
Strap material: python leather

Posted at

Jan 22, 2026, 6:57 PM

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