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] 1971 Omega Speedmaster Ref.145022-69 “ Straight Writing” $10,500 AUD / $7,800USD](https://preview.redd.it/p1wqu6oruszg1.jpg?width=640&crop=smart&auto=webp&s=b6c4279887eb83cb248ab034bc28d066e488717d)
1971 Omega Speedmaster Ref.145022-69 “ Straight Writing” $10,500 AUD / $7,800USD
A clean and honest early 1970s Omega Speedmaster Professional. Fully serviced by LWC in Perth in February 2026.
- Condition: Honest vintage condition, running well
- Case Material: Stainless steel
- Case Size: 42mm diameter
- Movement Type: Manual wind chronograph (cal. 861)
![[WTS] Genuine Omega Leather Strap, Speedmaster](https://preview.redd.it/9ggqk406dszg1.jpg?width=640&crop=smart&auto=webp&s=146302a8ec53e02613f38f63664ddc2fb82478d4)
Genuine Omega Leather Strap, Speedmaster
Up for sale is a genuine leather Omega Speedmaster band with a stainless steel deployant clasp, characterized by its light and comfortable design.
- Condition: Genuine leather strap with slight wear
- Width: 20mm
- Clasp material: stainless steel
- Shipping options: US shipping via FedEx or UPS
![[wts] 2024 Omega Speedmaster Moonphase
304.33.44.52.03.001 $7299](https://preview.redd.it/5e443hdy1szg1.jpg?width=640&crop=smart&auto=webp&s=2e0b5e27c1c48dadaf0a287beaa9cee072ac51d3)
2024 Omega Speedmaster Moonphase 304.33.44.52.03.001 $7299
This listing features a 2024 Omega Speedmaster Moonphase with two photo-realistic moons, one of OMEGA's most iconic timepieces.
- Condition: Pre Owned, Cosmetic Condition: 9/10
- Case Size: 44mm diameter
- Movement: 9904
- Power Reserve: 60 Hours
![[WTS] Omega Speedmaster Reduced 3510.50 Bracelet Set - 22 Links, Full size, excellent, OEM 1469/811](https://preview.redd.it/jpd7p9tprrzg1.jpg?width=640&crop=smart&auto=webp&s=daf047db7f639e5decb182270fd5228c5e78817f)
Omega Speedmaster Reduced 3510.50 Bracelet Set - 22 Links, Full size, excellent, OEM 1469/811
A vintage Omega Speedmaster Reduced bracelet set with 22 links, made of stainless steel and featuring an original Omega folding clasp.
- Condition: Excellent (94/100)
- Material: Stainless steel
- Metal finish: Original Omega finish
- Clasp type: Omega folding clasp
![[WTS] BNIB Omega Speedmaster Professional 310.30.42.50.01.001 $6,790](https://preview.redd.it/0ctdydnehrzg1.jpeg?auto=webp&s=74ad23e135844c1f446503923b99563ecef8cfbb)
BNIB Omega Speedmaster Professional 310.30.42.50.01.001 $6,790
The Omega Speedmaster Moonwatch Professional features a 42mm stainless steel case with a hesalite front and solid case back powered by the updated caliber 3861 movement.
- Condition: Brand new in box with warranty
- Case size: 42mm diameter
- Case thickness: 13.2mm
- Lug width: 20mm
![[WTS] Omega Speedmaster Racing 44.25mm White Dial 329.33.44.51.04.001 Co-Axial Master Chronometer. Full Set $6,955](https://preview.redd.it/8e2el1rffrzg1.jpg?width=640&crop=smart&auto=webp&s=23b5ef063aaf4327147392722938c37fa7481009)
Omega Speedmaster Racing 44.25mm White Dial 329.33.44.51.04.001 Co-Axial Master Chronometer. Full Set $6,955
This Omega Speedmaster Racing Master Chronometer features a white 'racing dial' with black sub-dials, powered by the Caliber 9900 Co-Axial Master Chronometer movement.
- Condition: Pre-owned, excellent condition
- Case size: 44.25mm
- Water resistance: 50m
- Movement: Automatic Caliber 9900 (Master Chronometer certified)
![[WTS] (OEM) Omega Speedmaster 20 mm Flat Link Bracelet](https://preview.redd.it/4gi9pkutdrzg1.jpg?width=640&crop=smart&auto=webp&s=fcc234aa63e7b8736858f8d859cd00c58343baf8)
(OEM) Omega Speedmaster 20 mm Flat Link Bracelet
This is an OEM Omega Speedmaster bracelet with a flat link design, suitable for various Speedmaster models. It features a stainless steel construction and a vintage-style foldover clasp.
- Condition: Great, lightly used
- Lug width: 20mm
- Taper: 20mm to 15mm
- Material: Stainless Steel
![[wts] 2026 Omega Speedmaster “Reverse Panda”
310.30.42.50.01.004 $9599](https://preview.redd.it/dixxc09d8rzg1.jpg?width=640&crop=smart&auto=webp&s=4bf8012f1cb5b624a8cccca6d4f361f6b066e558)
2026 Omega Speedmaster “Reverse Panda” 310.30.42.50.01.004 $9599
A 2026 Omega Speedmaster "Reverse Panda" with a 42mm steel case and black dial.
- Condition: Preowned, Cosmetic Condition: 9.9/10, Fully Functional
- Warranty card date: February 2026
- Case size: 42mm diameter
- Movement: 3861 caliber
![[WTS] 2020 Omega Speedmaster Moonphase Black 304.30.44.52.01.001 Full Set - $7,995](https://preview.redd.it/gspicj1w5rzg1.jpg?width=640&crop=smart&auto=webp&s=4f31b287624cbbb37e9b06c3acc79014c5c095d6)
2020 Omega Speedmaster Moonphase Black 304.30.44.52.01.001 Full Set - $7,995
Up for sale is a Omega Speedmaster Moonphase Black, a 2020 model featuring a moon phase display.
- 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