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

Omega Speedmaster METAS 3861 Sapphire Sandwich - Mint - 2023 (under Omega warranty until 2028) - Latest Version With Quick Adjust Clasp - Full Kit

Omega - 3861 · $6,900

This Omega Speedmaster Moonwatch is a full kit dated May 2023, under warranty until May 2028. It has some minor scratches on the clasp but runs flawlessly and is in great condition.

Condition: Mint with desk dive scratches on the clasp
Year of manufacture: 2023
Warranty expiration year: 2028
Case condition: Mint

Posted at

Mar 8, 2026, 8:54 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Mark II. 327.10.43.50.01.001.

Omega - 327.10.43.50.01.001 · $3,395

This Omega Speedmaster Mark II is a large watch that fits comfortably on the wrist, with additional details and photos available upon request.

Condition: Very good condition
Size: 41mm diameter
Location: New Jersey, USA

Posted at

Mar 8, 2026, 3:17 PM

Active

View listing on r/WatchExchange

Omega Speedmaster. Moonwatch + Moonphase. Sapphire Sandwich.

Omega - Speedmaster Moonwatch Sapphire Sandwich · $4,950

The watch is an Omega Speedmaster, also known as a Moonwatch, featuring a sapphire sandwich case.

Condition: Very clean
Location: New Jersey, USA

Posted at

Mar 8, 2026, 3:14 PM

Active

View listing on r/WatchExchange

Omega Speedmaster 3570.50-$4200

Omega - 3570.50 · $4,200

The Omega Speedmaster 3570.50 is a model that comes watch only with original band and Forstner band. It's suitable for everyday wear.

Condition: Good condition with some normal signs of wear
Band Count: 2
Seller Experience: Yes, several sales on AWWC, SBWC, Resco, and eBay

Posted at

Mar 8, 2026, 2:58 PM

Active

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Omega Speedmaster 3861 Sapphire Sandwich - Minty - May 2023 Card (under Omega warranty until 2028) - Quick Adjust Bracelet - Full Kit

Omega - 3861 · $6,999

A 2023 Omega Speedmaster Moonwatch 3861 sapphire sandwich, in great condition with a full kit and under warranty until 2028. The watch is running accurately at 0 spd.

Condition: great condition with minor desk dive scratches on the clasp
Warranty expiration date: May 2028
Retail price: $9K

Posted at

Mar 8, 2026, 2:04 PM

Active

View listing on r/WatchExchange