Omega
Omega Speedmaster HB-SIA Co-Axial GMT 321.92.44.52.01.001
The Omega Speedmaster HB-SIA Co-Axial GMT (reference 321.92.44.52.01.001) is a 44.25 mm titanium watch with a black dial. It runs on the caliber 3603 and is water resistant to 100 m.
Specifications
Case
- Reference
- 321.92.44.52.01.001
- Collection
- Speedmaster
- Case size
- 44.25 mm
- Case material
- Titanium
- Water resistance
- 100 m
- Bracelet / strap
- Rubber strap
Dial and bezel
- Dial
- Black
Movement
- Caliber
- 3603
Dial versions
This reference was made with these dials and finishes.
321.92.44.52.01.001 Black
Carbon-fibre style dial (per listing: Black Carbon)
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 |
|---|---|---|---|---|---|
| 321.92.44.52.01.001 (This watch) | 44.25 mm | Titanium | Black | 3603 | — |
| 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 HB-SIA Co-Axial GMT 321.92.44.52.01.001?
- The Omega Speedmaster HB-SIA Co-Axial GMT 321.92.44.52.01.001 has a 44.25 mm case.
- What movement does the Omega Speedmaster HB-SIA Co-Axial GMT 321.92.44.52.01.001 use?
- It uses the caliber 3603.
- How water resistant is the Omega Speedmaster HB-SIA Co-Axial GMT 321.92.44.52.01.001?
- It is water resistant to 100 metres.
- What is the Omega Speedmaster HB-SIA Co-Axial GMT 321.92.44.52.01.001 made of?
- The case is titanium. Bracelet or strap: Rubber strap.
Catalog facts checked October 2026.