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

2015 Omega Speedmaster Moonwatch 44.25mm 311.30.44.51.01.002 Black Dial - $5,000

Omega - 311.30.44.51.01.002 · $5,000

The watch being listed is a 2015 Omega Speedmaster Moonwatch with a 44.25mm black dial, featuring a stainless steel bracelet and leather strap.

Condition: Excellent overall condition
Bracelet condition: Stainless steel bracelet basically brand new, still has factory sticker on clasp
Included accessories: Original Omega Double boxed,Box and Papers - Yes,International Warranty card dated 2015,Pictograms Card with Leather Card holder,Operating Instructions booklet,Omega Hang Tag
Wrist size: 8.25inch

Posted at

Jan 15, 2026, 5:57 PM

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Omega Speedmaster 3511.50 Reverse Panda JAPAN EDITION

Omega - 3511.50 · $2,150

For sale is an Omega Speedmaster 3511.50 Reverse Panda JAPAN EDITION in great condition, with a clean crystal and running properly.

Condition: great condition
Payment Methods Accepted: pretty much every payment method including crypto
Local Meeting Available: yes
Payment Method Not Accepted: PayPal

Posted at

Jan 15, 2026, 5:39 PM

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Omega Speedmaster Professional Moonwatch 3573.50

Omega - 3573.50 · $4,550

This Omega Speedmaster Professional Moonwatch is in excellent condition with hardly any signs of wear.

Condition: Excellent condition, hardly any signs of wear
Payment Methods Accepted: Pretty much every payment method including crypto with a small fee
No Paypal Accepted: true
Other Payments: cash, credit cards, etc.

Posted at

Jan 15, 2026, 5:32 PM

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Omega Speedmaster “Ed White” Cal. 321 Tropical Dial Heavy Patina (Serviced)

Omega - 105.003-65 · $10,995

This Omega Speedmaster 'Ed White' features a stunning brown tropical dial and is one of the most collectible variants among Speedmaster enthusiasts, having been worn by astronauts during NASA's Gemini missions. The movement has been professionally serviced in July 2025, ensuring accurate timekeeping with chronograph functions performing as intended.

Condition: Very good condition
Size: 39mm diameter
Year: 1965
Movement serviced: July 2023

Posted at

Jan 15, 2026, 5:27 PM

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Omega Speedmaster Reduced - 39mm Two Tone - Ref 175.0033 - Price Reduced!

Omega - 175.0033 · $2,795

This Omega Speedmaster Reduced features a white dial and is available for sale as watch only on a high-quality leather strap.

Condition: great vintage condition, light hairlines on bezel and case
Case size: 39mm
Strap material: leather AM strap from Casanova

Posted at

Jan 15, 2026, 12:33 PM

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2021 Omega Speedmaster Professional Moonwatch Sapphire Sandwich $5,999

Omega - 310.30.42.50.01.002 · $5,999

The Omega Speedmaster Moonwatch Professional sapphire sandwich version features a robust and elegant 42mm stainless steel case, updated Caliber 3861 movement, and superior magnetic resistance.

Condition: Excellent time keeping with no significant gain or loss
Case size: 42mm diameter
Case thickness: 13.2mm
Lug width: 20mm

Posted at

Jan 15, 2026, 12:27 PM

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Omega Speedmaster Professional Full Kit with Extras (reposted and reduced)

Omega - 3861 · $5,600

an Omega Speedmaster Professional Moonwatch with Cal. 3861 movement and Hesalite crystal, purchased from an Authorized Dealer.

Condition: Daily wear, shows normal wear/use
Movement: Cal. 3861 (Master Chronometer)
Bracelet type: Current bracelet with tool-less sliding clasp adjustment

Posted at

Jan 15, 2026, 10:55 AM

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Omega Speedmaster Reduced 3523.80.00 – Blue Dial – Full Set + Serialized Tag – Mint – $3,500

Omega - 3523.80.00 · $3,500

This Omega Speedmaster Reduced features a unique blue dial, classic proportions and wearability, making it an excellent alternative for collectors who want something rarer than the standard black-dial Reduced.

Condition: Mint
Movement: Automatic chronograph
Case size: 39mm diameter
Dial color: Blue

Posted at

Jan 15, 2026, 10:34 AM

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