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

Current Listings

Omega Speedmaster Moonwatch Sapphire Sandwich - Co-Axial Calibre 3861 - 310.30.42.50.01.002 Full kit (Box, Papers, Extra links)

Omega - 310.30.42.50.01.002 · $5,999

A personal Omega Speedmaster Moonwatch with a Sapphire front and caseback, kept in excellent time.

Condition: Used, light wear, no dents or deep scratches
Case size: 42mm diameter
Movement: Co-Axial Calibre 3861
Water resistance: unknown

Posted at

Oct 24, 2025, 10:37 AM

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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

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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

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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

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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

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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

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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

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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

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Omega Speedmaster Apollo 17 45th Anniversary (2-yr warranty) Ref: 311.30.42.30.03.001

Omega - 311.30.42.30.03.001 · $7,600

This Omega Speedmaster Apollo XVII is a limited edition watch commemorating the 45th anniversary of the final moon landing in 1972, featuring a polished blue ceramic dial and stainless steel case.

Condition: Very good condition with slight imperfections on the dial
Case Diameter: 42mm
Water Resistance: 50m / 167ft
Movement Type: Manual-Winding Chronograph Movement

Posted at

Oct 23, 2025, 9:37 AM

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