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.

Buy Now on Jomashop

This is an affiliate link

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 Professional Moonphase 44.25mm 304.33.44.52.03.001 Blue Dial

Omega - 304.33.44.52.03.001 · $7,550

2024 Omega Speedmaster Professional Moonphase in 44.25mm size with blue dial.

Condition: Pre-Owned, with wear on polished parts of case and worn but still usable strap
Case size: 44.25mm diameter

Posted at

Oct 24, 2025, 11:13 PM

Active

View listing on r/WatchExchange

[CANADA] Omega Speedmaster Reduced - MOP Dial - 39mm

Omega - 3534.79 · $2,400

A unique Omega Speedmaster Reduced featuring a mother of pearl dial with vibrant red Arabic numerals, available in a 39mm case size.

Condition: Very well preserved with expected wear for the age
Case Size: 39mm diameter
Movement: Omega automatic chronograph
Dial Material: Mother of pearl

Posted at

Oct 24, 2025, 12:39 PM

Active

View listing on r/WatchExchange

Omega Speedmaster ‘57 Blue Dial Full Set 331.10.42.51.03.001

Omega - 331.10.42.51.03.001 · $4,750

This Omega Speedmaster '57 Blue Dial features a blue dial and red chrono hands, dated 2015, and is in good condition with some scratches. It comes as a full set with original box, warranty cards, and extra links.

Condition: Good condition with scratches, serviced in 2017
Case diameter: 41.5mm
Lug width: 20mm

Posted at

Oct 24, 2025, 1:51 AM

Active

View listing on r/WatchExchange

Omega Speedmaster Day Date Blue Dial 3523.80 Automatic $1600

Omega - 3523.80 · $1,600

This Omega Speedmaster Day Date features a blue dial and is powered by an automatic movement.

Condition: Mint
Case Size: 39mm diameter
Bracelet Length: 17.5cm

Posted at

Oct 23, 2025, 9:32 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Reduce Mother of Pearl White Dial (Original Bracelet) - 2600$ Shipped

Omega - Speedmaster Reduced · $2,600

A lovely Omega Speedmaster reduced on the original omega bracelet with a Mother of Pearl white dial.

Condition: Working as it should, unknown recent service history
Bracelet size: 6.8 inches, with micro adjusts
Photos available: on Imgur

Posted at

Oct 23, 2025, 9:28 PM

Active

View listing on r/WatchExchange

Omega Speedmaster Rattrapante Split Seconds 3540.50 - Carbon Dial - $2600 SHIPPED

Omega - 3540.50 · $2,600

This Omega Speedmaster Rattrapante Split Seconds features a rare reference with a rattrapante (split-seconds) chronograph and a robust automatic movement. The watch has a 42mm diameter and a beautiful 3D Carbon Dial.

Condition: Good condition with light scratches on the case, bezel and bracelet.
Case Size: 42mm
Dial Material: Carbon

Posted at

Oct 23, 2025, 8:01 PM

Active

View listing on r/WatchExchange

Omega Speedmaster. Mother of pearl dial. 39mm. Sapphire Crystal. Automatic. Olympics Special Edition.

Omega - Speedmaster · $2,295

This Omega Speedmaster is a 39mm automatic watch featuring a mother of pearl dial and sapphire crystal. It's an Olympics Special Edition model.

Condition: Clean
Diameter: 39mm
Case material:
Movement: Automatic

Posted at

Oct 23, 2025, 7:27 PM

Active

View listing on r/WatchExchange

BNIB 2025 OMEGA Speedmaster Moonwatch Professional 310.30.42.50.01.001 Full Set 5 Year Warranty

OMEGA - 310.30.42.50.01.001 · $6,300

A brand new, unworn OMEGA Speedmaster Moonwatch Professional with a full set of accessories and a 5-year factory warranty.

Condition: New, unsized/unworn
Size: 42mm diameter
Year: 2025
Warranty: 5 year factory warranty

Posted at

Oct 23, 2025, 7:23 PM

Active

View listing on r/WatchExchange

Reduced Price! Omega Speedmaster “Triple Date” 3521.30.00 – Fully Overhauled by Omega Service Center (Jan 2025) – $2,175 OBO Shipped (CONUS)

Omega - 3521.30.00 · $2,175

For sale is my Omega Speedmaster Chronograph 'Triple Date' (Ref. 3521.30.00), a fully overhauled timepiece with excellent condition and functionality.

Condition: Excellent post-service condition — running perfectly
Case Material: stainless steel
Case Size: 39mm diameter
Lug Width: 18mm

Posted at

Oct 23, 2025, 2:49 PM

Active

View listing on r/WatchExchange