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 Tokyo Gold Green 522.20.42.30.06.001](https://preview.redd.it/nv04z1h8i50h1.jpg?width=640&crop=smart&auto=webp&s=6200378b02b4bd014c6052f766a0dabff210574a)
Omega Speedmaster Tokyo Gold Green 522.20.42.30.06.001
Omega Speedmaster Tokyo Gold Green in mint condition, complete with original boxes and papers.
- Condition: Mint condition with minor wear on the bracelet
- Bracelet state: has all stickers
- Extra strap included: yes
- Strap type: crocodile leather
![[WTS] Omega Speedmaster Reduced Sapphire Crystal 3539.50 39mm $2,900](https://preview.redd.it/jn76cgweh50h1.jpg?width=640&crop=smart&auto=webp&s=33756c14e0e39717f352fc58d2401124ceb291f8)
Omega Speedmaster Reduced Sapphire Crystal 3539.50 39mm $2,900
This Omega Speedmaster Reduced is a 39mm watch recently serviced by a professional watchmaker and features a sapphire crystal.
- Condition: Used, with minor cosmetic damage (nicks around the bezel)
- Case Size: 39mm
- Bracelet Length: 18.5cm
![[WTS] 2005 Omega Speedmaster Professional "Sapphire Sandwich" Ref. 3573.50 Watch + Card and Tag - $4,800](https://preview.redd.it/szl912qzz40h1.jpg?width=640&crop=smart&auto=webp&s=8ec5d61fa79305ba3c38ad9c52133584aee2b52c)
2005 Omega Speedmaster Professional "Sapphire Sandwich" Ref. 3573.50 Watch + Card and Tag - $4,800
This Omega Speedmaster Professional Moonwatch is a stainless steel watch with a sapphire crystal and an Omega 1863 movement, featuring a 42mm diameter case.
- Condition: Good
- Case material: Stainless steel
- Crystal material: Sapphire
- Movement: Omega 1863
![[WTS] 2020 Omega Speedmaster Moonphase Black 304.30.44.52.01.001 Full Set - $7,995](https://preview.redd.it/dma1pdo9r40h1.jpg?width=640&crop=smart&auto=webp&s=8853bfe7eb5646b566d87889c88899a057f6f4d8)
2020 Omega Speedmaster Moonphase Black 304.30.44.52.01.001 Full Set - $7,995
A 2020 Omega Speedmaster Moonphase Black, in excellent condition with minimal signs of wear, featuring a moon phase function and a sleek black design.
- Condition: Excellent condition with minimal signs of wear
- Year: 2020
- Contents: Watch, Inner & Outer Box, Card Holder, International Warranty Card, Pictograms Card, Master Chronometer Card, Instructions Manual
![[WTS] Omega Speedmaster Reduced (automatic)](https://preview.redd.it/bgpbli97b40h1.jpg?width=640&crop=smart&auto=webp&s=0ed70bf2ec83716240686b3eda512439aa08c359)
Omega Speedmaster Reduced (automatic)
A beautiful Omega Speedmaster Automatic in good condition, featuring the iconic Speedmaster design in a more wearable 38mm automatic configuration.
- Condition: Good overall condition for its age, normal signs of wear consistent with age
- Movement: Automatic chronograph movement
- Case Material: Stainless steel
- Crystal: Hesalite
![[WTS] UNWORN Omega Speedmaster ’57 Master Chronometer – BOX & PAPERS – 332.10.41.51.01.001](https://preview.redd.it/5ux47hcc040h1.jpg?width=640&crop=smart&auto=webp&s=f8a53e5625a4429163384c232b69dd0573d247ea)
UNWORN Omega Speedmaster ’57 Master Chronometer – BOX & PAPERS – 332.10.41.51.01.001
- Condition: Unworn
- Movement: Manual-wind Cal 9906
- Case material: Stainless-steel
- Case diameter: 40.5mm
![[WTS] 2026 Omega Speedmaster Professional White Dial 310.32.42.50.04.002 Full Set $7,250](https://preview.redd.it/yuqfxi83m00h1.jpg?width=640&crop=smart&auto=webp&s=e50215acc82fe04d705bda6556ae79a792fe5bc4)
2026 Omega Speedmaster Professional White Dial 310.32.42.50.04.002 Full Set $7,250
A modern Moonwatch configuration featuring a lacquered white dial paired with a strap setup, delivering a clean and high-contrast look while maintaining the iconic Speedmaster design.
- Condition: Like new
- Case Size: 42mm diameter
- Case Material: Stainless steel
- Movement: Manual wind (Omega Calibre 3861 Master Chronometer)
![[WTS] Omega Speedmaster Professional Moonwatch – Ref. 310.30.42.50.01.001 – Excellent Condition – 2022 - $5,399 🔥🔥🔥](https://preview.redd.it/2g4w4rhjl00h1.jpg?width=640&crop=smart&auto=webp&s=ca26ab2f0528d3296025d5d8a348290a49c5ae41)
Omega Speedmaster Professional Moonwatch – Ref. 310.30.42.50.01.001 – Excellent Condition – 2022 - $5,399 🔥🔥🔥
This Omega Speedmaster Professional Moonwatch features the iconic Hesalite crystal and manual-wind Master Chronometer movement 3861. It's in excellent condition with only extremely light signs of wear and is running strong with warranty left for peace of mind.
- Condition: Excellent, minimal hairline scratches.
- Case Size: 42mm
- Movement: Manual-wind Co-Axial Master Chronometer (Cal. 3861)
- Crystal: Hesalite
![[WTS] Omega OEM Integrated Speedmaster Moonwatch Rubber Strap with Aftermarket Clasp - (Strap Backordered thru Omega)- $275 shipped](https://preview.redd.it/0lsufzcl700h1.jpg?width=640&crop=smart&auto=webp&s=4669d2da8247d2fd43735018797e3e92df77e288)
Omega OEM Integrated Speedmaster Moonwatch Rubber Strap with Aftermarket Clasp - (Strap Backordered thru Omega)- $275 shipped
A black Omega rubber strap designed for the Speedmaster Professional, made from OEM materials and featuring an aftermarket clasp.
- Condition: Very Good
- Material: rubber
- Lug size compatibility: 20mm