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Both the oil system and the solar-powered e-Crown must function; either failure requires Ressence service and affects the watch materially.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Oil-filled chamber clarity | Clear, bubble-free oil across the dial chamber | Cloudy, yellowed, or bubbled oil; seal degradation |
| movement | e-Crown response after light exposure | e-Crown responds and sets time after adequate light exposure | Non-responsive e-Crown after light exposure; module failure |
| dial | Solar cell function through the dial | Solar cell charges e-Crown under ambient light | e-Crown does not charge; solar cell failure |
| caseback |
The Type 4 adds a solar-powered e-Crown function to the oil-fill ROCS display. A solar cell integrated beneath the sapphire dome harvests light to charge the e-Crown electronic module. 44mm titanium case. The solar cell is visible as a dark ring within the oil-filled display.
| Ressence serial and reference |
| Serial and reference correctly engraved |
| Missing or incorrect engravings; non-genuine caseback |
| Oil-filled display with an integrated solar cell (visible as a peripheral dark ring beneath the sapphire) and the e-Crown module on the caseback. Black or grey dial. 44mm titanium case without a physical crown. |
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