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 Date 3511.50 Full Set $2,099](https://preview.redd.it/1gucvjorv0yg1.jpg?width=640&crop=smart&auto=webp&s=fb469784f41edee17a4cfd89679f79d0f30ddd25)
(Omega) Speedmaster Date 3511.50 Full Set $2,099
For sale is an Omega Speedmaster Date, reference 3511.50, a reduced variant made for the Japanese market. This automatic watch features a 39mm case and 18mm lugs.
- Condition: Excellent external condition, running well internally
- Case size: 39mm diameter
- Lug-to-lug length: 45mm
- Thickness: 13.8mm
![[WTS] Omega Speedmaster Reduced - Mother of Pearl - White Dial - Factory Strap](https://preview.redd.it/dz5tog5830yg1.jpg?width=640&crop=smart&auto=webp&s=1d90129f6a1309a727a43e893e3a63ebe006b906)
Omega Speedmaster Reduced - Mother of Pearl - White Dial - Factory Strap
A rare and unique Omega Speedmaster reduced model with a 39mm case, featuring a stunning Mother of Pearl dial.
- Condition: Good condition for the age
- Case size: 39mm
- Strap type: Factory Omega leather strap
![[WTS] Omega Speedmaster Racing - 32630405001002](https://preview.redd.it/1pb5ivpoxzxg1.jpg?width=640&crop=smart&auto=webp&s=caffe10a1590958fb2b742ef2da1d77d0254e63e)
Omega Speedmaster Racing - 32630405001002
This Omega Speedmaster Racing is in good condition, having been worn a handful of times. It features desk diving scratches on the clasp.
- Condition: Pre-owned, minor scratches
- Scratches location: Clasp
- Shipping discussion possible: true
![[WTS] Omega Speedmaster Moonwatch Hesalite 1861 3570.50.00 ( excellent / 2007 / box and papers )](https://preview.redd.it/0cnmix5ovyxg1.jpg?width=640&crop=smart&auto=webp&s=63126ef6cb3c1d2a3783dfeb47e0aff454ff0253)
Omega Speedmaster Moonwatch Hesalite 1861 3570.50.00 ( excellent / 2007 / box and papers )
This Omega Speedmaster Moonwatch Professional Chronograph 1861 is a 42mm stainless steel watch with Hesalite crystal, reference # 3570.50.00.
- Condition: Excellent condition
- Case size: 42mm diameter
- Movement: 1861 Omega Calibre
![[WTS] Omega Speedmaster Sapphire New 2026, $7500](https://preview.redd.it/qh72hqvuzxxg1.jpg?width=640&crop=smart&auto=webp&s=b2466f9d8bd316366c3e5048f37b9946e025da22)
Omega Speedmaster Sapphire New 2026, $7500
This listing is for a brand new Omega Speedmaster Sapphire, featuring a reference number of 310.30.42.50.01.002 and coming with its original box and warranty.
- Condition: Brand New Condition
- Shipping Cost: $150 for USA
- Payment Methods: Wire or Credit Card (+4.9% & 4 days clearance)
- Warranty Year: 2026
![[WTS] Omega Speedmaster Moonshine Green Dial 2023, $29k+✈️](https://preview.redd.it/b3acapo8zxxg1.jpg?width=640&crop=smart&auto=webp&s=37413b5f4e0709897748328bd5988e8066a3c3f8)
Omega Speedmaster Moonshine Green Dial 2023, $29k+✈️
2023 Omega Speedmaster Moonshine Green Dial, with a layer of aftermarket watch protection film on.
- Condition: Preowned Condition
![[WTS][US] Omega Speedmaster First Omega in Space - FOiS - 310.30.40.50.06.001 - Full Set](https://preview.redd.it/jm2sanyzfxxg1.jpg?width=640&crop=smart&auto=webp&s=4cb8a335b8b495253814ff6022493e2fe292ddc2)
[US] Omega Speedmaster First Omega in Space - FOiS - 310.30.40.50.06.001 - Full Set
Up for sale is an Omega Speedmaster First Omega in Space - FOiS - Full Set, which functions perfectly mechanically without issue.
- Condition: Fantastic with few hairlines
- Case Condition: few hairlines on case, clasp, and bracelet
- Box Status: Full Set
![[WTS] Omega Speedmaster Moonwatch (Reverse Panda) – Full Kit](https://preview.redd.it/hkd0val5bvxg1.jpg?width=640&crop=smart&auto=webp&s=6d156243fb068326ffdae937bdc8da5bb7e0d1cc)
Omega Speedmaster Moonwatch (Reverse Panda) – Full Kit
A classic Omega Speedmaster Moonwatch with an updated Co-Axial Master Chronometer movement, available as a full set including box, papers, and cards.
- Condition: Amazing, slight mark on the case
- Size: 40mm diameter
- Movement: Cal. 3861
- Power reserve: ~50 hours
![[WTS] Omega Speedmaster Pro White Dial](https://preview.redd.it/rz7ucn2h3uxg1.jpg?width=640&crop=smart&auto=webp&s=c72ad979815b7a8a619991656e9fb26565ae5b49)
Omega Speedmaster Pro White Dial
A beautiful Omega Speedmaster Pro with a white dial is up for sale, featuring a manual wind movement and coming as a full kit with card dated 09/2025.
- Condition: great condition with minimal wear on the case
- Size: 42mm diameter
- Movement: 3861 manual wind movement