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
![[WTS] Omega Speedmaster 39mm olympic 3516.20](https://preview.redd.it/121go4jp50eg1.jpg?width=640&crop=smart&auto=webp&s=3478e9cca169cbbe1fbdb6145cfbe9086c47be43)
Omega Speedmaster 39mm olympic 3516.20
This is a beautiful Omega Speedmaster limited Olympic edition, with minimal signs of wear and coming with an Omega red travel case.
- Condition: very good condition with minimal sign of wear
- Case size: 39mm
- Movement accuracy: -+4/day
- Included accessories: omega red travel case
![[WTS] Omega Speedmaster 3861 Bracelet](https://preview.redd.it/xj67cs6lazdg1.jpg?width=640&crop=smart&auto=webp&s=85637a845c99cfcf9322473104ff0eaeecba865e)
Omega Speedmaster 3861 Bracelet
This Omega Speedmaster is a brand new model with additional features such as tool free microadjust and it has not been worn.
- Condition: New, never worn
- Links included: true
- Clasp condition: plastic still on
- Adjustment method: tool free microadjust
![[WTS] Omega Speedmaster Professional Sapphire Sandwich – Cal. 1863 – New OEM Omega 3861 Bracelet With Quick Adjust Clasp – Spiralwinder Dot Over 90 Ceramic Bezel](https://preview.redd.it/eibhfok1wxdg1.jpg?width=640&crop=smart&auto=webp&s=c3e3244a70aa011b8b4f8ec3dd689f0665c6ea9a)
Omega Speedmaster Professional Sapphire Sandwich – Cal. 1863 – New OEM Omega 3861 Bracelet With Quick Adjust Clasp – Spiralwinder Dot Over 90 Ceramic Bezel
This Omega Speedmaster Professional Sapphire Sandwich is powered by the highly regarded caliber 1863 and features a Spiralwinder Ceramic DON tachymètre bezel. The watch has been upgraded with a new OEM 3861 bracelet installed at the Omega Boutique.
- Condition: Excellent
- Movement: Cal. 1863
- Crystal: Sapphire front & back
- Bezel: Spiralwinder Ceramic DON (Dot Over Ninety) tachymètre bezel
![[WTS] OMEGA Speedmaster 🌘🌑“Dark Side of the Moon”Co-Axial Master Chronometer Chronograph|Ref. 310.92.44.51.01.001| 2025 | Full Set in Like New Condition](https://preview.redd.it/wdbhc2mdpxdg1.jpg?width=640&crop=smart&auto=webp&s=a1e550ea35c47efb184141a12e9b1fc8abf02739)
OMEGA Speedmaster 🌘🌑“Dark Side of the Moon”Co-Axial Master Chronometer Chronograph|Ref. 310.92.44.51.01.001| 2025 | Full Set in Like New Condition
The OMEGA Speedmaster 'Dark Side of the Moon' is a modern icon that blends OMEGA's space-faring heritage with advanced materials, crafted entirely in black ceramic for exceptional scratch resistance and lightweight wearability.
- Condition: Excellent
- Case size: 44.25 mm
- Set: Full set (box, papers, 5 year warranty)
- Movement: Co-Axial Master Chronometer Calibre 9908
![[WTS] Omega Speedmaster. 39mm. Special Dial.](https://preview.redd.it/g5hh4ppwfxdg1.jpeg?auto=webp&s=9f6bb06d948b1936c42120340f03afffccf51e0a)
Omega Speedmaster. 39mm. Special Dial.
A 39mm Omega Speedmaster with a special texture dial is being sold. The watch is located in NJ USA and comes with the option for a Facetime viewing.
- Case diameter: 39mm
- Movement type: automatic
![[WTS] Omega Speedmaster. 39mm. White Ceramic. Very nice.](https://preview.redd.it/vg3z74icfxdg1.jpeg?auto=webp&s=b33324fb81fa5f56e0c48212c2f053ff89c7dfce)
Omega Speedmaster. 39mm. White Ceramic. Very nice.
This Omega Speedmaster is a 39mm watch with white ceramic and strong lume. It's a great timepiece that comes with additional photos available upon request.
- Case size: 39mm
- Material: white ceramic
- Lume strength: strong
![[WTS] Omega Speedmaster FOIS – Full Set – $4,300 Shipped OBO](https://preview.redd.it/5wcxjlovbudg1.jpg?width=640&crop=smart&auto=webp&s=9460323e912181da91ac4a040d9446faed8de89f)
Omega Speedmaster FOIS – Full Set – $4,300 Shipped OBO
The Omega Speedmaster FOIS is a widely regarded, wearable watch that captures classic early Speedmaster proportions with its 39.7mm straight-lug case.
- Condition: Very good overall
- Case size: 39.7mm diameter
- Movement type: Manual winding
- Crystal material: Hesalite
![[WTS] Omega Speedmaster Reduced](https://preview.redd.it/a0v0sfedjtdg1.jpg?width=640&crop=smart&auto=webp&s=fcdb1f1a7f30df0c6bbf26c36295569b6f31ab44)
Omega Speedmaster Reduced
A used Omega Speedmaster Reduced purchased from Japan with original box and papers.
- Condition: Great working shape
- Original Box And Papers: Yes, with Japanese documentation
- Extra Links: Fitting up to 7.5-8 inches
![[WTS] OMEGA Speedmaster "Dark Side of the Moon" Apollo 8 Ref. 311.92.44.30.01.001 + Apollo 8 Gen2 Strap + Deployant Clasp - ULTIMATE SET! 🔥$10,000🔥](https://preview.redd.it/iqow4jggetdg1.jpg?width=640&crop=smart&auto=webp&s=c1580e5c83458430359952bbeeea1aa760bab676)
OMEGA Speedmaster "Dark Side of the Moon" Apollo 8 Ref. 311.92.44.30.01.001 + Apollo 8 Gen2 Strap + Deployant Clasp - ULTIMATE SET! 🔥$10,000🔥
The OMEGA Speedmaster 'Dark Side of the Moon' Apollo 8 commemorates the 50th anniversary of the Apollo 8 mission, featuring a black ceramic case with a skeletonized and laser-ablated dial. The watch is powered by the Calibre 1869 movement and comes in an ultimate set with various accessories.
- Condition: UNWORN
- Case material: black ceramic
- Diameter: 44.25mm
- Movement: Calibre 1869 with blackened bridges and mainplate