Omega Speedmaster Speedmaster Professional Moonwatch Sapphire Sandwich / Strap
Reference 3873.50.31
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.
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

Omega Speedmaster Racing - White Dial - 329.30.44.51.04.001 ( excellent )
This Omega Speedmaster Racing Master Co-Axial in White Dial is a high-end chronograph watch with a stainless steel case and Master Co-Axial movement.
- Condition: Excellent
- Case size: 44.25mm diameter
- Movement: Master Co-Axial 9900 Chronometer

>>reduced further<< vintage omega speedmaster professional pre-moon 145.022-69
This is a pre-moon Omega Speedmaster Professional reference 145.022-69ST, featuring an Omega calibre 861 movement with a 29 million serial number from 1970. The watch has been overhauled in 2022 and comes on a generic tan strap.
- Condition: Good vintage condition
- Calibre: Omega calibre 861
- Movement condition: Overhauled in 2022
- Case diameter: 42 mm
310.32.42.50.02.001 Omega Speedmaster Silver Snoopy COMPLETE SET/BRAND NEW
The Omega Speedmaster Silver Snoopy is a complete set in brand new condition, including the OEM bracelet.
- Condition: Brand new/unworn
- Bracelet Type: OEM Speedmaster Bracelet
Omega Speedmaster Professional Moonwatch CK2998 White Steel LIMITED
The Omega Speedmaster Professional Moonwatch is a limited edition model with a silver manual winding movement and a stainless steel case. It features a tachymetre bezel, sapphire crystal, and an Omega black leather band.
- Condition: Excellent
- Case material: Stainless Steel
- Case dimensions: 39.7mm diameter
- Dial color: Silver

Omega Speedmaster Professional Moonphase
Up for sale is an Omega Speedmaster Professional Moonphase reference 3575.20, featuring date, chronograph, tachymeter and moonphase functions. The watch has a 42mm case with 18k white gold bezel and 1866 manual wind movement.
- Condition: excellent
- Case Diameter: 42mm
- Movement Type: manual wind
- Bezel Material: 18k white gold
Omega Speedmaster Dark Side of the Moon "Apollo 8" 44.25MM 311.92.44.30.01.001
The Omega Speedmaster Dark Side of the Moon features a super lightweight ceramic case, an insane skeleton dial with a laser-etched lunar surface, and a hand-wound 1869 movement.
- Condition: Excellent Condition
- Case material: ceramic
- Dial type: skeleton
- Movement type: hand-wound

2022 Omega Speedmaster Professional Moonwatch 310.30.42.50.01.002 Sapphire
A 2022 Omega Speedmaster Professional Moonwatch in like new condition, described by the seller as worse than it really is.
- Condition: Like new
- Material: Sapphire crystal


BNIB Omega SPEEDMASTER SILVER SNOOPY AWARD 50TH ANNIVERSARY 2025 FULL SET
A 2025 Omega Speedmaster Professional Moonwatch, specifically the Silver Snoopy Award edition, featuring a 42mm stainless steel case and silver dial with blue subdials. This watch is part of the 50th Anniversary celebration and comes with a full set of accessories and documentation.
- Condition: Brand New in Box (BNIB)
- Case Size: 42mm
- Movement:
- Water Resistance: