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.

Buy Now on Jomashop

This is an affiliate link

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 3570.50-$4200

Omega - 3570.50 · $4,200

A Omega Speedmaster in good condition, comes with original bracelet and forstner.

Condition: good
Seller Type: established eBay account
Additional Items: eBay authentication card, original bracelet, forstner

Posted at

Mar 7, 2026, 10:12 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Moonwatch Professional Sapphire 3861 (310.30.42.50.01.002) – 2025 Full Set – $6350

Omega - 310.30.42.50.01.002 · $6,350

This Omega Speedmaster Moonwatch Professional features the Master Chronometer Calibre 3861, a manual wind movement with 50-hour power reserve and anti-magnetic to 15,000 gauss. The watch has a 42mm stainless steel case and black stepped dial.

Condition: Excellent overall condition, light signs of wear on the bracelet and clasp
Movement: Omega Co-Axial Master Chronometer Calibre 3861 (manual wind, 50-hour power reserve, anti-magnetic to 15,000 gauss)
Case size: 42mm
Water resistance: 50m

Posted at

Mar 7, 2026, 9:44 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Professional Moonwatch Full Steel 145.022-69 Ghost Bezel Yellow Patina Step Dial 1969 (Serviced) 🔥

Omega - 145.022-69 · $5,250

This Omega Speedmaster Moonwatch presents beautifully in full steel, showcasing a strong and sharp case with thick lugs that retain their original shape.

Condition: Serviced with minor polishing in the past
Diameter: 42mm
Year: 1969
Movement: 861 caliber movement

Posted at

Mar 7, 2026, 9:26 PM

Active

View listing on r/WatchExchange

(Reserved) Omega Speedmaster Broad Arrow

Omega - Speedmaster Broad Arrow

A 2000s Omega Speedmaster broad arrow in excellent condition, running well.

Condition: pristine condition
Year of manufacture: early 2000’s

Posted at

Mar 7, 2026, 8:55 PM

Active

View listing on r/WatchExchange

Omega Speedmaster ’57 Black Dial (2024) - excellent condition - $5750

Omega - 332.10.41.51.01.001 · $5,750

A modern interpretation of the original 1957 Speedmaster with a black dial, Broad Arrow hands, and a slimmer case. The watch features a manual wind Co-Axial Master Chronometer movement and has a water resistance of 50m.

Condition: excellent
Case Size: 40.5mm diameter
Thickness: ~12.99 mm
Movement Type: manual wind, Co-Axial Master Chronometer

Posted at

Mar 7, 2026, 6:00 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Moonphase Chrono 18k Sedna Gold & Steel 304.23.44.52.13001 B&P

Omega - 304.23.44.52.13001 · $10,195

This Omega Speedmaster Moonphase Chrono features a brown sun-brushed dial with diamond polished indexes and hands, accurate moonphase indication, and Ceragold tachymeter scale.

Movement: Meta certified Co-Axial Master Chronometer 9904
Case material: Stainless steel-18K Sedna gold
Diameter: 44.25 mm

Posted at

Mar 7, 2026, 4:19 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Professional Moonwatch Full Steel Yellow Patina Original Step Tritium Dial (Unpolished)

Omega - 145.022-69 · $5,235

This Omega Speedmaster Professional Moonwatch is a strong example of the highly regarded reference 145.022-69, featuring a razor-sharp case and crisp edges with excellent overall definition.

Condition: Unpolished, original condition
Size: 42mm
Year: 1969
Bezel condition: Signs of age and light fading

Posted at

Mar 7, 2026, 2:44 PM

Active

View listing on r/WatchExchange