Omega Speedmaster Speedmaster Professional Moonwatch Sapphire Sandwich / Strap

Reference 3873.50.31

Omega Speedmaster Professional Moonwatch Sapphire Sandwich / Strap

About this watch

The Omega Speedmaster Professional Moonwatch Sapphire Sandwich, also known as the 3873.50.31, is a testament to the brand's rich history and commitment to precision. This luxury watch features a stunning black dial with contrasting white stick and dot indexes, giving it a classic yet modern vibe suitable for both formal and casual occasions. The round stainless-steel case strikes a perfect balance between presence and elegance, measuring 42mm in diameter. A sapphire crystal on both the front and back of the watch enhances durability and provides a stunning view of the intricate movement through the open case back. With its iconic design, reliable Omega caliber 1863 movement, and versatile wearability, this watch earns its place in any collection. Whether you're a history buff, a watch connoisseur, or someone looking to elevate your style, the Speedmaster is a worthy companion. It's not just about telling time; it's about cherishing every moment.
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MSRP: $5,400
Market Price: $3,887

Key Features

  • Omega caliber 1863 movement
  • 48-hour power reserve
  • 21,600 vibrations per hour
  • Chronograph function for timing events
  • Sapphire crystal on front and back of the watch
  • Water resistance up to 50 meters
  • Leather strap with secure buckle

Specifications

Brand
Omega
Family
Speedmaster
Model
Speedmaster Professional Moonwatch Sapphire Sandwich / Strap
Reference
3873.50.31
Movement
1863
Movement Features
  • Hours, Minutes, Small Seconds
  • Chronograph
Case
Stainless Steel 42mm
Dial Color
Black
Crystal
Sapphire
Water Resistance
50

Current Listings

[WTS] Omega Speedmaster Reduced 39mm Serviced ⏱

Omega Speedmaster Reduced 39mm Serviced ⏱

Omega - Speedmaster Reduced · $2,250
  • Condition: Pre-owned, serviced
  • Case Size: 39mm diameter
  • Lug To Lug: 45mm length
  • Lug Width: 18mm width
Posted at
Jan 28, 2026, 9:30 PM
Active
View listing on r/WatchExchange
[WTS] Omega Speedmaster Professional Moonwatch Steel Step Dial Yellow Patina 1969 (Serviced)

Omega Speedmaster Professional Moonwatch Steel Step Dial Yellow Patina 1969 (Serviced)

Omega - 145.022-69 · $4,995
This Omega Speedmaster Moonwatch features a step dial and yellow patina, showcasing visible signs of use that add character.

  • Condition: Very nice overall condition, with honest wear consistent with age
  • Size: 42mm diameter
  • Year: 1969
  • Case condition: Visible signs of use that add character
Posted at
Jan 28, 2026, 9:24 PM
Active
View listing on r/WatchExchange
[WTS] 2018 Omega Speedmaster 44mm Ceramic Dark Side Of The Moon 311.92.44.51.01.007 Full Set

2018 Omega Speedmaster 44mm Ceramic Dark Side Of The Moon 311.92.44.51.01.007 Full Set

Omega - 311.92.44.51.01.007 · $6,450
2018 Omega Speedmaster Dark Side Of The Moon, a black ceramic watch with a mechanical chronograph movement.

  • Condition: Excellent Preowned Condition with almost no signs of wear on the case and bezel.
  • Case material: Black Ceramic
  • Bezel: Black Ceramic Bezel
  • Dial: Gloss Black Ceramic Dial
Posted at
Jan 28, 2026, 8:28 PM
Active
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[WTS] Omega Speedmaster Reduced

Omega Speedmaster Reduced

Omega - 3510.50 · $2,500
Selling my Omega Speedy Reduced, a 39mm case size watch with a bracelet that fits about an 18cm wrist.

  • Case Size: 39mm diameter
  • Wrist Fit: fits about 18cm wrist
Posted at
Jan 28, 2026, 8:21 PM
Active
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[WTS] Omega Speedmaster Professional Moonwatch 3573.50

Omega Speedmaster Professional Moonwatch 3573.50

Omega - 3573.50 · $4,350
For sale is an Omega Speedmaster Professional Moonwatch reference 3573.50, this watch is in excellent condition with hardly any signs of wear.

  • Condition: Excellent
  • Payment Methods Accepted: crypto, other methods including a fee
  • Local Pickup Available: yes
  • Trade In Eligible Brands: Tudor, Cartier, Rolex, Omega, Breitling, AP
Posted at
Jan 28, 2026, 2:23 PM
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[WTS] Omega Speedmaster Sapphire Sandwich 310.30.42.50.01.002

Omega Speedmaster Sapphire Sandwich 310.30.42.50.01.002

Omega - 310.30.42.50.01.002 · $5,500
A Omega Speedmaster Moonwatch Professional 'Sapphire Sandwich' in excellent condition, featuring a 3861 movement and a full set with bracelet.

  • Condition: Excellent, minor fit issues with bracelet
  • Bracelet Length: ~7.5"
  • Links Extra: 2
Posted at
Jan 28, 2026, 2:20 PM
Active
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[WTS] Omega speedmaster Hesalite Full set $4,200

Omega speedmaster Hesalite Full set $4,200

Omega - Speedmaster · $4,200
This is a listing for an Omega Speedmaster with Hesalite crystal.

  • Key1: Hesalite
Posted at
Jan 28, 2026, 1:19 PM
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[WTS] Omega Speedmaster Sapphire Sandwich 310.30.42.50.01.002

Omega Speedmaster Sapphire Sandwich 310.30.42.50.01.002

Omega - 310.30.42.50.01.002 · $5,500
A Omega Speedmaster Moonwatch Professional with a 3861 movement and sapphire crystal caseback.

  • Condition: Excellent, minor fitment issue on the bracelet
  • Movement: Calibre 3861
  • Bracelet size: ~7.5" wrist, with 2 extra links for adjustment
Posted at
Jan 28, 2026, 11:17 AM
Active
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[WTS] Omega Speedmaster FOIS 310.30.40.50.06.001 — Full Set — 2024 — Warranty to 2029

Omega Speedmaster FOIS 310.30.40.50.06.001 — Full Set — 2024 — Warranty to 2029

Omega - 310.30.40.50.06.001 · $6,850
This Omega Speedmaster FOIS is a modern reissue of the model worn by astronaut Wally Schirra during the Mercury-Atlas 8 mission. It features straight lugs, a symmetrical case, and the hand-wound Caliber 3861 with Master Chronometer certification.

  • Condition: great pre-owned condition, light normal wear
  • Caliber: hand-wound Caliber 3861
  • Warranty Expires: 2029
  • Case Size: 40mm diameter
Posted at
Jan 28, 2026, 11:03 AM
Active
View listing on r/WatchExchange