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 CK2998 Limited Edition “Blue Panda” - Full Set - 311.33.40.30.02.001

Omega - 311.33.40.30.02.001 · $6,895

This listing is for an Omega Speedmaster CK2998 Limited Edition 'Blue Panda' in a full set with all original accessories.

Condition: Amazing, barely worn
Case size: 40mm diameter
Movement: Manual winding OMEGA calibre 1861

Posted at

Feb 3, 2026, 1:35 PM

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OEM OMEGA Speedmaster 3861 Clasp (Not Quick Adjust - Original Clasp With Two Micro Adjust Positions) - Great Condition - $99 shipped CONUS

OMEGA - Speedmaster 3861 · $99

The listing is for an OEM Omega Speedmaster with a specific clasp, which does not have the quick adjust feature but has two micro adjust positions.

Condition: Great Condition
Clasp type: Original Clasp
Micro adjust positions: Two

Posted at

Feb 3, 2026, 1:29 PM

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Omega Speedmaster Day-Date Reduced ref 3222.80 PRICE DROP

Omega - 3222.80 · $3,250

This Omega Speedmaster Day-Date ref 3222.80 features a vibrant blue dial and stainless steel bracelet with day, date, month, chronograph, and 24-hour indicators.

Condition: Excellent, minor hairlines on the bracelet and a spot of discoloration in the first link
Dial size: 40mm
Water resistance: 50m
Bracelet length: full original links still attached

Posted at

Feb 3, 2026, 1:29 PM

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Omega Speedmaster Reduced - 39mm Two Tone - Ref 175.0033 - Price Reduced!

Omega - 175.0033 · $2,750

This is a Beautiful Omega Speedmaster Reduced, reference number 175.0033. The watch is running and all the functions are working as they should.

Condition: Great vintage condition, light hairlines on bezel and case
Case size: 39mm diameter
Strap type: high quality leather strap from Casanova

Posted at

Feb 3, 2026, 1:21 PM

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2025 Omega Speedmaster ’57 Sedna Gold Two-Tone 41.5mm 331.22.42.51.01.001 Full Set Like New

Omega - 331.22.42.51.01.001 · $8,750

A vintage-inspired Speedmaster with a modern Master Co-Axial movement, featuring an 18K Sedna gold case and black dial.

Condition: Mint
Case material: 18K Sedna gold
Diameter: 41.5mm

Posted at

Feb 3, 2026, 1:05 PM

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Omega Speedmaster Racing Master Chronometer 44.25mm 329.33.44.51.04.001 Full Set Mint

Omega - 329.33.44.51.04.001 · $8,950

A modern, motorsport-inspired take on the Speedmaster line.

Condition: Mint
Size: 44.25mm
Year: 2022

Posted at

Feb 3, 2026, 1:03 PM

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Omega Speedmaster Racing. 329.32.44.51.01.001, Full set.

Omega - 329.32.44.51.01.001 · $5,850

This is a 2021 Omega Speedmaster Racing with the reference number 329.32.44.51.01.001, sold as a full set including warranty card.

Year: 2021
Set: Full set
Warranty: Warranty card included

Posted at

Feb 3, 2026, 11:39 AM

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Omega Speedmaster Professional Snoopy 50th Anniversary Ref: 310.32.42.50.02.001 BNIB

Omega - 310.32.42.50.02.001 · $11,800

This is a 50th Anniversary Ref: 310.32.42.50.02.001 Omega Speedmaster Professional Snoopy that comes with the complete package and extra Omega travel box in red leather.

Condition: New, never worn (BNIB)
Warranty End Year: 2025
Box Contents: complete package and extra Omega travel box in red leather

Posted at

Feb 3, 2026, 9:46 AM

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2025 Omega Speedmaster Professional Moonwatch White Dial 310.30.42.50.04.001 Full Set

Omega - 310.30.42.50.04.001 · $7,800

Additional Details: Model: Speedmaster Professional Moonwatch Ref. 310.30.42.50.04.001, a manual wind Omega watch with a stainless steel case measuring 42mm in diameter.

Condition: Very nice preowned condition with some light scratches on the case and bracelet
Case material: Stainless Steel
Case dimensions: 42mm diameter
Bezel material: Stainless Steel

Posted at

Feb 2, 2026, 8:05 PM

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