Blue dials and steel cases have a natural chemistry — the cool tones of Oystersteel amplify the depth of a blue sunburst finish rather than competing with it. The Lady-Datejust 178240 in blue pairs a smooth bezel and full Oystersteel case with a Jubilee bracelet at 30mm, creating a compact watch that brings colour to the wrist without the warmth of gold. For buyers who want a modern, casual Lady-Datejust with personality, this configuration delivers exactly that.
Key Specifications
| Specification | Detail |
|---|---|
| Reference | 178240 |
| Case Size | 30mm |
| Case Material | Oystersteel |
| Bezel | Smooth domed, Oystersteel |
| Dial | Blue sunburst |
| Crystal | Sapphire with Cyclops lens |
| Movement | Automatic with date |
| Water Resistance | 30m |
| Bracelet | Jubilee, five-piece links |
| Clasp | Concealed folding Crownclasp |
| Functions | Hours, minutes, seconds, date |
The 178240 Blue Dial Up Close
The blue sunburst finish radiates from the centre with fine brushed lines, shifting from a mid-blue under diffused light to a deeper navy at the edges and a vivid royal blue in direct sunlight. Applied stick markers in Oystersteel carry luminescent fill, standing out clearly against the saturated background. A date window at three o’clock is magnified by the Cyclops lens.
The smooth steel bezel provides a clean, unadorned frame that keeps visual focus on the colourful dial. The Jubilee bracelet in full Oystersteel adds a dressier feel than the Oyster option, draping softly with its five-piece link design. Browse all blue-dial Lady-Datejust models in the Lady-Datejust collection.
Movement Options: Swiss vs Japanese
Select between two automatic movement tiers at checkout:
- Swiss automatic — smooth high-beat sweep, generous power reserve, and caliber architecture modelled on the genuine Lady-Datejust movement. The refined option for mechanical enthusiasts.
- Japanese automatic — Miyota-based caliber with consistent accuracy and easy worldwide servicing. A reliable everyday performer that requires minimal upkeep.
Quickset date and hacking seconds are standard on both options.










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