The Wristwatch Field Guide

Omega Speedmaster HB-SIA Co-Axial GMT Chronograph

321.90.44.52.01.001 Archive · used only

The Omega Speedmaster HB-SIA Co-Axial GMT Chronograph is a discontinued chronograph watch with a titanium (grade undisclosed) case, finished with brushed and polished. It ships on a matching exotic-material bracelet rather than a strap. No longer offered new; listed here as an archive reference for the used market.

All Omega watchesExotic-material chronograph watchesTitaniumGMT
Material
Titanium
Grade / type
Titanium (grade undisclosed)
Water resistance
100 m
Reference
321.90.44.52.01.001
Type
Chronograph
Price
– · Numbered edition (2013), discontinued; secondary market only
Case diameter
44.3 mm
Origin
Switzerland
Movement
Automatic chronograph, Co-Axial, GMT
Caliber
Omega Co-Axial 3603
Power reserve
52 hours
Complications
Chronograph, GMT
Colour
Grey
Surface treatment
Brushed and polished
Caseback
Titanium
Nickel-free
Not verified (clasp or buckle material not confirmed)
Bracelet / strap
Titanium bracelet
Matching bracelet
Standard
Crystal
Sapphire, anti-reflective
Display back
No
Dial
Black carbon fibre
Dial colours
Black
Lume
Super-LumiNova
Availability
No longer offered
Status
Numbered edition (2013), discontinued
Not published
Thickness, Lug-to-lug, Weight, Hardness, Construction
Medium confidence Verified Jun 2026 Source: Omega (maker product page) Suggested by u/FlakyGood
Facts are free to cite with a link.
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Alternatives to the Omega Speedmaster HB-SIA Co-Axial GMT Chronograph

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Frequently asked questions

What is the case material of the Omega Speedmaster HB-SIA Co-Axial GMT Chronograph?

The Omega Speedmaster HB-SIA Co-Axial GMT Chronograph has a titanium (grade undisclosed) case with a titanium caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Omega Speedmaster HB-SIA Co-Axial GMT Chronograph?

It is 44.3 mm in diameter, and water resistant to 100 m.

How much does the Omega Speedmaster HB-SIA Co-Axial GMT Chronograph cost, and is it available?

It is no longer offered new; the guide keeps it as an archive reference for the used market.

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