Pre-Owned
Longines HydroConquest 39mm Blue Ceramic | L3.780.4.96.9
Longines HydroConquest 39mm Blue Ceramic | L3.780.4.96.9
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Selling one of my all-time favourite Swiss divers: the Longines HydroConquest Automatic 39mm with blue sunburst dial, ceramic bezel and matching blue rubber strap.
Longines international warranty until 24.08.2029. Originally purchased from Pleasance & Harper on 24.08.2024.
I've bought and sold quite a few HydroConquests over the years and I think this is my favourite variant of this generation.
The 39mm case is an absolutely perfect fit for smaller wrists such as mine (6.5 inches). These 39mm models are incredibly difficult to find compared to their larger counterparts and, in my opinion, are among the best value Swiss divers for smaller wrists.
The blue sunburst dial and ceramic bezel look phenomenal in the light, and the rubber strap makes it a very comfortable everyday sports watch. A proper 300m diver with fantastic wrist presence despite its relatively compact dimensions.
Near mint cosmetic condition:
Only the lightest signs of casual wear on the case, visible upon close inspection. Nothing obtrusive, and overall the watch looks absolutely stunning on the wrist. The sapphire crystal is pristine and unmarked.
The original Longines rubber strap is in perfect condition and currently sized to fit a large wrist of around 8 inches. It can be cut to fit smaller wrists.
Excellent mechanical condition (timegrapher tested across 5 positions):
Approximately 0 to +4 sec/day depending on position, with strong 258° to 320° amplitude and 0.6 to 1.0 ms beat error at 25,200 vph.
The Longines L888 automatic movement is performing exceptionally well overall, showing excellent accuracy, healthy amplitude and outstanding positional consistency across the tested positions.
Comes full set with:
- Original Longines outer box
- Inner presentation box
- Warranty card (24.08.2024)
- Instruction booklet
- Original Longines tags

Condition, delivery & returns
Authenticity & Inspection
Watches are individually sourced and inspected by Zero Hour Watches before sale. See the description and photographs for details of this particular watch.
Condition & Photography
Please review all photographs carefully, as they form part of the description. Notable imperfections are photographed and described where possible. See the individual listing for condition and any test results.
Water Resistance
For pre-owned watches, water resistance should not be assumed unless the individual listing states a recent pressure test. Avoid water exposure if it has not been verified.
Shipping
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International delivery is available to selected destinations offered at checkout. Rates and estimated delivery times are shown at checkout, and applicable import charges are the recipient’s responsibility.
See our Shipping Policy for full details.
Returns
For UK consumer online purchases, you can cancel without giving a reason within 14 days after delivery, then have 14 days to send the item back. Statutory rights for faulty or misdescribed goods remain unaffected. Read the full Refund Policy.
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