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Omega Constellation Observatory Co-Axial Master Chronometer 39.4mm
The Omega Constellation Observatory Co-Axial Master Chronometer 39.4mm (140.13.39.21.10.001) is a dress watch from Omega: a 39.4 mm O-MEGASTEEL case, 12.23 mm thick and 47.2 mm lug to lug, with an automatic Omega 8914 movement and 30 m water resistance.
Going by its 47.2 mm lug to lug, it should sit within the flat top of a wrist of about 6.4 inches (16.3 cm) or larger.
Research found it at $10,900 list in the US (checked August 2026).
Specifications
From the research, with the sources for each group of facts. Unknown means no source confirmed it.
| The watch [1][2][3] | |
|---|---|
| Brand | Omega |
| Reference | 140.13.39.21.10.001 |
| Category | Dress |
| Production | Current (introduced 2026) |
| Case and size [1][2][3] | |
| Case diameter | 39.4 mm |
| Lug to lug | 47.2 mm |
| Thickness | 12.23 mm |
| Lug width | 19 mm |
| Case material | O-MEGASTEEL (Omega proprietary high-purity steel alloy via Pressure Electro Slag Remelting; higher polish capability) |
| Crystal | Box-shaped sapphire, front and back |
| Water resistance | 30 m |
| Weight | Unknown |
| Movement [1][2][3] | |
| Movement | Omega 8914, automatic |
| Power reserve | 60 h (twin barrels) |
| Accuracy | Master Chronometer standard |
| Bracelet [1][2][3] | |
| Bracelet or strap | Shiny alligator leather strap (dark green) on polished buckle; 19mm lug width |
| Clasp | Pin buckle, polished, matching case material |
| Price and warranty (US) [2][3] | |
| List price (US) | $10,900 steel entry point (Teddy Baldassarre editorial, 2026); exact US list for the green ref not separately stated |
| Street price (US) | Unknown |
| Used price (US) | Unknown |
| Warranty | 5-year Omega warranty (standard current policy) |
Will it fit?
A watch wears comfortably when its lugs stay on the flat top of the wrist. Here is the 47.2 mm lug to lug against the flat top estimated for common wrist sizes.
| Wrist | Flat top | Fit |
|---|---|---|
| 6 in 15.2 cm | 47 mm | At the edge |
| 6.5 in 16.5 cm | 51 mm | Comfortable |
| 7 in 17.8 cm | 55 mm | Comfortable |
| 7.5 in 19.1 cm | 59 mm | Comfortable |
| 8 in 20.3 cm | 63 mm | Comfortable |
Check it against your own wrist An estimate, not a guarantee; how the method works is on the tool page.
What the research found
These are the research’s judgments, scored against Holden’s priorities, not his own words.
Strengths
- Genuine design story: faithful pie-pan and dog-leg-lug revival of the 1952 Constellation [1][2]
- First two-hand watch certified Master Chronometer - real metrological engineering, not spec-sheet garnish [1][2]
- 18K white gold diamond-polished furniture and O-MEGASTEEL case polish - execution well above typical steel dress watches [1]
- Box sapphires front and back, 12.23mm slim-ish profile for a Master Chronometer automatic [2]
Weaknesses
- $10,900 in steel is 'a high-horology price point for a largely industrial watch' - stamped, not hand-guilloche, dials on steel refs [3]
- 39.4mm and 12.23mm judged large/thick for a pure dress watch by several critics [2][3]
- 30m WR and alligator strap confine it to dress duty [2]
- Brand-new collection - no ownership or reliability track record
Research scores, 0 to 10
| Execution and feel in the hand | 9.3 |
|---|---|
| Design identity | 9.0 |
| Value at a realistic price | 5.8 |
| Long-term ownership | 8.8 |
| Movement and engineering | 9.2 |
| Wearability and proportions | 8.4 |
| Versatility and durability | 6.2 |
| Fit with Holden's collection | 7.4 |
Also on Holden’s list
Other dress watches on his list.
Sources
- Observatory Constellation O-MEGASTEEL Master Chronometer Certified Watch 140.13.39.21.10.001 | OMEGA US omegawatches.com · read August 26, 2026
- Hands-On: The All-New Omega Constellation Observatory Collection (incl. Video) monochrome-watches.com · read August 26, 2026
- Omega Constellation Observatory Review teddybaldassarre.com · read August 26, 2026
Personal research, not a source of truth. Spotted an error? Email a correction.