Strap for Hydroconquest Quartz 41 Black

The Longines HydroConquest L3.689.4.53.2 features a lug width of 20 millimetres. This measurement refers to the distance between the centres of the two lateral attachment pins on the case. To verify strap compatibility, measure with a calliper the distance between the attachment holes: it must be exactly 20mm. Standard pins are 1.8 millimetres in diameter.

The choice depends on intended use. For daytime elegance, alligator in chocolate brown or black with a steel deployante offers superior versatility, softening the tool-watch character. For intensive aquatic use, vegetable-tanned calf guarantees durability and splendid ageing. Shell cordovan combines snowy elegance with robustness. Black FKM rubber remains the most practical solution if you wear the watch actually in water. Canvas NATO is ideal for those desiring ease of replacement and rapid drying.

Remember that strap replacement on a Longines with a screw-down case (like yours) is a delicate operation. Obtain a dedicated strap removal tool. Position the watch on a soft surface (rubber mat), locate the small extraction holes inside the lugs, insert the tool and push gently until the pin emerges from the opposite side. Once the old strap is removed, insert the new one by aligning the holes and pushing the pins until they click into place. If you lack experience, entrust the task to a qualified watchmaker.

Any strap with a lug width of 20 millimetres and standard 1.8mm pins is compatible. Online you will find straps in alligator, vegetable calf, shell cordovan, NATO and FKM rubber, all available in this size. Always verify that the manufacturer explicitly specifies 20mm; some universal straps may require adjustments. Quality certified straps also offer personalised finishes: leather selection, stitching thread colour, adjustable keeper.

Durability depends on material and use. Vegetable-tanned calf, subjected to average wear and dried regularly, lasts 4–7 years before replacement is needed. Alligator, more robust, can exceed 10 years. Shell cordovan offers longevity similar to alligator. If you frequently wear the watch in water, reduce these timeframes by 30–40 per cent: constant humidity accelerates ageing and deterioration. FKM rubber, conversely, remains stable over time but may lose elasticity after 5–8 years of intense UV exposure.