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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteThe Omega Speedmaster Spacemaster Z-33 is a discontinued, pilot-oriented ana-digital quartz watch—not a conventional mechanical Speedmaster chronograph. Its calibre 5666 drives both the analog hands and LCD, combining timekeeping and chronograph functions with UTC, dual time zones, an alarm, a perpetual calendar and a flight log. Omega lists the titanium-bracelet version under reference 325.90.43.79.01.001 and marks it discontinued.
What is the Omega Z-33?
The Z-33 pairs analog hands with an LCD, with the crown at 3 o’clock used to adjust the hands and four pushers plus the crown controlling digital functions. Omega describes calibre 5666 as a temperature-compensated, multi-function quartz movement developed with professional pilots. The design is pilot-oriented; a 2012 watch-specialist article specifically connects its case shape to Omega’s 1969 Flightmaster, while Omega describes the case more generally as inspired by its pilot-line design.
Despite the Speedmaster name, this is not a conventional mechanical Speedmaster chronograph. It is a quartz ana-digital watch whose multiple digital functions extend well beyond a standard chronograph.
What functions does the Omega Z-33 have?
Omega lists the following functions for the Z-33:
- Date and perpetual calendar, including calendar memory for irregularities such as February 29 through February 28, 2100.
- UTC and two time zones.
- Alarm.
- Chronograph and countdown timer.
- Programmable pilot-oriented functions and a flight log that can record up to ten flights with date and time.
These are the functions Omega identifies for the watch; detailed button-by-button operating instructions are not included here.
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#1 Best Overall
- Model 304.33.44.52.01.001
What size is the Omega Z-33?
For reference 325.90.43.79.01.001, Omega lists a 43 mm case diameter, 53 mm lug-to-lug length and 19.9 mm thickness. These three measurements give a better sense of the watch’s substantial wrist presence than diameter alone. Its lug width is 21 mm.
| Specification | Omega-listed value |
|---|---|
| Case diameter | 43 mm |
| Lug-to-lug | 53 mm |
| Thickness | 19.9 mm |
| Lug width | 21 mm |
| Case and bracelet material | Titanium |
| Crystal | Box-shaped sapphire, anti-reflective treatment on both sides |
| Water resistance | 30 m / 3 bar |
| Movement | Omega quartz calibre 5666 |
| Listed battery life | 24 months |
All figures in this table are Omega product specifications for the cited reference, accessed in 2026. The 24-month battery-life figure is the listed specification, not a guarantee of runtime for an individual watch.
Is the Omega Speedmaster Spacemaster Z-33 discontinued?
Omega’s Japan-market product page marks reference 325.90.43.79.01.001, the titanium-bracelet version, as discontinued. That status does not establish whether any individual retailer or second-hand seller has stock; availability depends on the seller and market. Treat a purchase as a pre-owned or seller-dependent prospect unless a seller confirms otherwise.
What is the difference between the Omega Z-33 strap versions?
Omega identifies three references with different supplied configurations:
Rank #3
- Model 304.33.44.52.03.001
| Reference | Configuration |
|---|---|
| 325.90.43.79.01.001 | Titanium bracelet |
| 325.92.43.79.01.001 | Rubber strap |
| 325.92.43.79.01.002 | Leather strap |
Check the complete reference against the listing and confirm which strap or bracelet is actually included. Although Omega lists a 21 mm lug width for the bracelet reference, that measurement alone does not establish compatibility with every aftermarket strap; end shape, attachment hardware and variant-specific fit can matter.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check when buying a pre-owned Z-33
Because the model is discontinued, compare listings using the full reference and the watch’s actual condition rather than relying on a title or stock image. Useful checks include:
Rank #4
- Rubber
- Rotating bezel, gmt
- Automatic-self-wind movement
- Case diameter: 40mm
- Water resistant to 330 feet
- Reference and configuration: Match the full reference to the titanium-bracelet, rubber-strap or leather-strap version, and verify what is included.
- Case and completeness: Inspect case condition and confirm the included accessories against the seller’s description.
- Battery and service history: Ask for documented battery replacement or service history; the listed battery life does not establish the remaining life in a specific example.
- Authenticity and seller: Assess the seller’s evidence and the watch’s identifying details before purchase.
- Fit: Compare the 43 mm diameter, 53 mm lug-to-lug and 19.9 mm thickness with a watch you already know fits comfortably.
Omega’s official specification and function details for reference 325.90.43.79.01.001 are on its Japan-market product page. The 1969 Flightmaster design connection is described in the contemporary article from Time and Watches.
Quick Recap
Best Value
- Stainless steel case
- Black dial
- Swiss-automatic movement
- Case diameter: 40mm
- Water resistant to 330 feet
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
