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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 was a 44.3 mm titanium chronograph with an Omega Co-Axial 3603 automatic movement. It is no longer made, so this page is a reference for buying one used.

All Omega watchesChronograph watchesOn a titanium braceletGMT
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
Finish technology
Natural finish
Caseback
Titanium
Nickel-free
Unconfirmed (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 Sep 2026 Source: Omega (maker product page) Spec checksGrade Jun 2026 Suggested by u/FlakyGood
Facts are free to cite with a link.
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Frequently asked questions

What grade of titanium is the Omega Speedmaster HB-SIA Co-Axial GMT Chronograph?

Titanium, with no grade stated. The caseback is titanium too. The record is at medium confidence, so check the maker's page before relying on it.

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

The case is 44.25 mm across. It is 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 made, so the only way to buy one is used.

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