Omega
Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001
“White Side of the Moon”
The Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) (reference 311.98.44.51.55.001) is a 44.25 mm White ceramic watch with a white dial. It runs on the automatic caliber 9300 with a 60-hour power reserve and is water resistant to 50 m. It is no longer in production.
Specifications
Case
- Reference
- 311.98.44.51.55.001
- Nickname
- White Side of the Moon
- Collection
- Speedmaster
- Case size
- 44.25 mm
- Case material
- White ceramic
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
- Bracelet / strap
- White alligator strap
Dial and bezel
- Dial
- White
- Bezel
- Diamond-set white ceramic
Movement
- Movement
- Automatic
- Caliber
- 9300
- Power reserve
- 60 hours
- Frequency
- 28,800 vph
Production
- Production
- Discontinued
Dial versions
This reference was made with these dials and finishes.
311.98.44.51.55.001 White Side of the Moon
Mother-of-pearl dial and subdials, diamond-set indexes · Diamond; dial indexes and bezel (count not sourced) · “White Side of the Moon”
How it compares within the Speedmaster family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 311.98.44.51.55.001 (This watch) | 44.25 mm | White ceramic | White | 9300 | — |
| 310.30.42.50.04.001 | 42 mm | Stainless steel | White | 3861 | 2024– |
| 310.92.44.50.06.001 | 44.25 mm | Grey ceramic | Grey (skeletonised) | 3869 | 2025– |
| 310.92.44.50.06.002 | 44.25 mm | Grey ceramic | Grey (skeletonised) | — | 2025– |
| 318.90.45.79.01.003 | 45 mm | Titanium | Black | 5622 | 2022– |
| 332.10.41.51.01.001 | 40.5 mm | Stainless steel | Black | 9906 | 2022– |
| 332.10.41.51.03.001 | 40.5 mm | Stainless steel | Blue | 9906 | 2022– |
| 522.30.38.50.04.001 | 38 mm | Stainless steel / ceramic | White | 3330 | 2025– |
| 522.30.38.50.04.002 | 38 mm | Stainless steel / ceramic | White | 3330 | 2025– |
About the Speedmaster family
The Speedmaster was introduced in 1957 as a sports chronograph with the tachymeter scale on the bezel. It passed NASA's tests in 1965 and was worn on the Moon in 1969, which is why the hand-wound Professional is known as the Moonwatch. Its movement has gone from the caliber 321 to the 861 and 1861, and in 2021 to the Master Chronometer 3861.
Around the Moonwatch the line includes the Speedmaster Racing, the ceramic Dark Side of the Moon, automatic chronographs, the smaller Speedmaster 38 and many special editions. Dealers check the caliber, the crystal (Hesalite or sapphire), the caseback engraving and the reference, and on vintage pieces look closely at dial, bezel and hands.
Quick answers
- What size is the Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001?
- The Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001 has a 44.25 mm case.
- What movement does the Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001 use?
- It uses the automatic caliber 9300, with a 60-hour power reserve.
- How water resistant is the Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001?
- It is water resistant to 50 metres.
- Is the Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001 still in production?
- Discontinued.
- What is the Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001 made of?
- The case is White ceramic. Bracelet or strap: White alligator strap.
- What is the Omega Speedmaster White Side of the Moon (diamond-set, mother-of-pearl) 311.98.44.51.55.001 nicknamed?
- Dealers and collectors call it the “White Side of the Moon”.
Catalog facts checked October 2026.