Omega Speedmaster Speedmaster Professional Moonwatch 3861 Stainless Steel / Black / Plexi / Kanjar Oman

Reference 310.30.42.50.01.003

Omega Speedmaster Professional Moonwatch 3861 Stainless Steel / Black / Plexi / Kanjar Oman

About this watch

The Omega Speedmaster Professional Moonwatch 3861 is a piece of history wrapped around your wrist, with its rich lineage and modern upgrades capturing the hearts of watch enthusiasts and collectors alike. This manual-winding chronograph movement features a co-axial escapement and silicon balance spring, making it resistant to magnetic fields up to 15,000 gauss. The plexi glass provides a warm, vintage feel that many collectors adore, while the stainless steel case measures 42mm in diameter and has a water resistance of 50 meters. This timepiece is perfect for everyday wear, suitable for both formal and casual occasions. With its stunning design, robust movement, and versatility, it's a celebration of heritage, precision, and style.
Buy Now on Jomashop
This is an affiliate link

Key Features

  • Omega Caliber 3861 Movement
  • Plexi Glass with Vintage Feel
  • 42mm Stainless Steel Case
  • 50m Water Resistance
  • Manual-Winding Chronograph Function
  • Co-Axial Escapement and Silicon Balance Spring

Specifications

Brand
Omega
Family
Speedmaster
Model
Speedmaster Professional Moonwatch 3861 Stainless Steel / Black / Plexi / Kanjar Oman
Reference
310.30.42.50.01.003
Movement
3861
Movement Features
  • Small Seconds, Hours, Minutes
  • Chronograph
  • Chronometer
Case
Stainless Steel 42mm
Dial Color
Black
Crystal
Plexi
Water Resistance
50

Current Listings

[WTS] Omega Speedmaster Reduced. 3510.50.

Omega Speedmaster Reduced. 3510.50.

Omega - 3510.50 · $2,350
This Omega Speedmaster Reduced is being sold in good condition and has an aftermarket strap. The watch comes with shipping from NJ USA.

  • Condition: Clean, runs well
  • Strap: Aftermarket strap
Posted at
Apr 15, 2026, 6:59 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Moonwatch Titanium Co-Axial 311.93.44.51.03.001 - 9.9/10 - $6,250

Omega Speedmaster Moonwatch Titanium Co-Axial 311.93.44.51.03.001 - 9.9/10 - $6,250

Omega - 311.93.44.51.03.001 · $6,250
A sharp example of the Omega Speedmaster Moonwatch Co-Axial Titanium, featuring a 44.25mm titanium case and blue ceramic tachymetric bezel.

  • Condition: 9.9/10
  • Case size: 44.25mm diameter
  • Power reserve: 60 hours
Posted at
Apr 15, 2026, 1:22 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Day Date 3523.80

Omega Speedmaster Day Date 3523.80

Omega - 3523.80 · $2,450
For sale is an Omega Speedmaster Day Date with a beautiful blue dial, in excellent condition and running super solid.

  • Condition: excellent
  • Payment methods accepted: crypto, other (with small fee)
  • Location: southwest FL
  • Open to trades for: Tudor, Cartier, Rolex, Omega, Breitling, AP
Posted at
Apr 15, 2026, 10:55 AM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Broad Arrow 3594.50

Omega Speedmaster Broad Arrow 3594.50

Omega - 3594.50 · $3,350
A pre-owned Omega Speedmaster Broad Arrow in excellent condition with very little wear.

  • Condition: Excellent condition with very little wear
  • Payment Methods Accepted: Multiple payment methods including crypto
  • Available To Trade For: Tudor, Cartier, Rolex, Omega, Breitling, AP
Posted at
Apr 15, 2026, 10:40 AM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Reduced 3510.50 2 AVAILABLE

Omega Speedmaster Reduced 3510.50 2 AVAILABLE

Omega - 3510.50 · $2,550
Two Omega Speedmaster Reduced in great condition for sale, both running solid and coming as watch only.

  • Condition: Great condition, some light wear
  • Bracelet condition: Pretty good
  • Crystals condition: 0 or very minimal scratches
Posted at
Apr 15, 2026, 10:14 AM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster 3210.50 Black Dial $2,090

Omega Speedmaster 3210.50 Black Dial $2,090

Omega - 3210.50 · $2,090
The Omega Speedmaster Date is a 40mm stainless steel automatic chronograph with a black dial and tachymeter bezel, featuring a sporty classic look and an automatic movement.

  • Condition: pre-owned, good condition with scuffs due to age
  • Case size: 40mm diameter
  • Lug-to-lug length: 45mm
  • Lug width: 19mm
Posted at
Apr 15, 2026, 9:42 AM
Active
View listing on r/WatchExchange
[WTS] INCREDIBLE Vintage 18K Gold Omega Speedmaster Tribute to Astronauts Ref BA145.022 Unpolished Holy Grail Example!!!

INCREDIBLE Vintage 18K Gold Omega Speedmaster Tribute to Astronauts Ref BA145.022 Unpolished Holy Grail Example!!!

Omega - BA145.022-69 · $48,500
This is a vintage Omega Speedmaster Tribute to Astronauts ref BA145.022-69, one of the first solid gold Speedmasters produced in 1969.

  • Condition: Excellent, unpolished with patina
  • Case size: 42mm diameter
  • Bracelet length: 7.5 inches
  • Movement: Lemania-based hand wound caliber 861
Posted at
Apr 14, 2026, 9:59 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster '57 - current gen - warranty till Apr 2027

Omega Speedmaster '57 - current gen - warranty till Apr 2027

Omega - 332.10.41.51.01.001 · $6,099
A current generation Omega Speedmaster '57 with a April 29, 2022 date, featuring a scratch on the crystal near 12 o'clock.

  • Condition: Very good, hairlines and desk diving marks
  • Bracelet size: 17cm
  • Box included: yes
  • Warranty expiration date: Apr 2027
Posted at
Apr 14, 2026, 9:41 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Triple Calendar w/ EBay authentication

Omega Speedmaster Triple Calendar w/ EBay authentication

Omega - Speedmaster Triple Calendar · $2,300
This Omega Speedmaster features an automatic chronograph, day, month, and year calendar with a clean and uncluttered dial. The watch is 42 mm in size but wears smaller on the wrist.

  • Condition: Good condition, some signs of use
  • Size: 42mm diameter, 40-41mm on the wrist
  • Authentication: eBay authenticated
Posted at
Apr 14, 2026, 9:02 PM
Active
View listing on r/WatchExchange