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

2024 Omega Speedmaster “First Omega in Space” 310.30.40.50.06.001 – Full Set – $6,450 Shipped

Omega - 310.30.40.50.06.001 · $6,450

A modern reissue of the Speedmaster worn by Wally Schirra during the Sigma 7 mission, featuring a slim 39.7mm case with Master Chronometer technology.

Condition: Excellent
Case Size: 39.7mm
Water Resistance: 50m
Movement: Manual-wind chronograph (Omega Caliber 3861, Master Chronometer)

Posted at

Jan 14, 2026, 3:28 PM

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OMEGA Speedmaster Professional - Sapphire Sandwhich ( White Dial ) 310.30.42.50.04.001 $7,700 plus label

OMEGA - 310.30.42.50.04.001 · $7,700

Speedmaster Professional with a White Dial and Sapphire Sandwhich case.

Posted at

Jan 14, 2026, 2:09 PM

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Omega Speedmaster professional Oem rubber strap & deployant $525 shipped

Omega - Speedmaster professional · $525

This Omega Speedmaster professional watch is being sold to make room for the sale of a rubber strap and deployant, which are also included.

Condition: Good
Strap type: Rubber strap
Deployment buckle type: Deployant

Posted at

Jan 14, 2026, 1:38 PM

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2023 Omega Speedmaster Moonphase 44.25mm 304.33.44.52.03.001 Blue Dial - Box and Papers

Omega - 304.33.44.52.03.001 · $7,199

This 2023 Omega Speedmaster Moonphase features a 44.25mm blue dial and is in good condition with light signs of wear on the case and clasp.

Condition: Good preowned condition
Case Size: 44.25mm diameter
Warranty: 5 year warranty remaining

Posted at

Jan 14, 2026, 10:53 AM

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1989 Omega Speedmaster Automatic 175.0032. Vintage Speedy | Runs well

Omega - 175.0032 · $2,700

A vintage Omega Speedmaster Automatic from 1989, featuring incredible tritium lume patina and a few variations in caseback and bracelet.

Condition: Excellent, with honest but light wear
Caseback variations: multiple caseback designs available for this reference
Bracelet variations: multiple bracelet options available for this reference

Posted at

Jan 14, 2026, 9:56 AM

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Omega Speedmaster First Omega In Space FOIS 40mm 310.30.40.50.06.001 | 8/2025 Full Set

Omega - 310.30.40.50.06.001 · $7,250

This is a 40mm Omega Speedmaster First Omega In Space (FOIS) with a Master Chronometer certification.

Condition: Pre-Owned, Great Condition
Bezel condition: Clean
Crystal condition: Clean
Bracelet length: 23 Links

Posted at

Jan 13, 2026, 10:27 PM

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Omega Speedmaster 38 324.30.38.50.01.001 | 2024 Full Set w/ Extra OEM Strap

Omega - 324.30.38.50.01.001 · $3,999

A 2024 Omega Speedmaster 38 with a slight scratching on the anti-reflective coating, available for sale in excellent condition with extra OEM strap and various other accessories.

Condition: Pre-Owned | Slight scratching on AR Coating
Water resistance: 350 AMP

Posted at

Jan 13, 2026, 10:23 PM

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2024 Omega Speedmaster “First Omega in Space” 310.30.40.50.06.001 – Full Set + Extra Uncle Bracelet – $6,950 Shipped

Omega - 310.30.40.50.06.001 · $6,950

A modern reissue of the Speedmaster worn by Wally Schirra during the Sigma 7 mission, featuring a slimmer 39.7mm case and vintage-inspired aesthetic.

Condition: Excellent
Case size: 39.7mm
Movement: Omega Caliber 3861, Manual-wind chronograph
Crystal: Sapphire

Posted at

Jan 13, 2026, 7:58 PM

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20mm Omega Integrated Speedmaster Black Rubber Strap & Omega Clasp - (Backordered) 2. 20mm Omega SMP 300 Black Rubber Strap & Omega OEM Clasp

Omega - 032Z017245, 032CVZ015752 · $575

The seller is offering two Omega watch straps for sale: a black rubber strap with integrated Speedmaster design and an SMP 300 Black Rubber Strap. Both straps are OEM and come with their respective clasps.

Strap Type1: Integrated Speedmaster Rubber Strap
Strap Type2: SMP 300 Black Rubber Strap
Clasp Type1: Omega OEM Stainless Steel Deployant Clasp

Posted at

Jan 13, 2026, 5:42 PM

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