Strap for HydroConquest 41 Automatic Stainless Steel / Blue / Bracelet

The lug width of the Longines HydroConquest L3.742.4.96.6 measures 21 millimetres. This dimension is the international standard for Longines mid-size diver models and is measured perpendicular to the case's longitudinal axis, between the inner points of each lug. A strap precisely dimensioned to 21mm ensures a perfect fit without unsightly lateral gaps.

The choice depends on usage. For formal elegance, vegetable-tanned alligator in havana or black polished shell cordovan enhance the diving character whilst maintaining sophistication. For everyday versatility, tobacco or dark grey calf leather offers transition between business and leisure contexts. For frequent diving, a 840 denier ballistic nylon NATO or FKM (Viton) rubber guarantees waterproofness and durability in cold water conditions.

The Longines HydroConquest L3.742.4.96.6 is fitted with classic non-integrated lugs. Strap change requires a dedicated tool (spring bar tool or pin remover) to precisely remove the elastic pins that secure the strap to the lugs. We recommend performing the operation on a soft surface to avoid scratching the case. If uncertain, consult an authorised dealer or specialist atelier.

Yes, any strap with a 21-millimetre lug width is compatible with the Longines HydroConquest L3.742.4.96.6. Online you will find a wide range of 21mm straps ready for dispatch, customisable in material (alligator, vegetable leather, NATO, rubber), colour and stitching thread. The Casati Milano atelier also creates bespoke made-to-measure straps with personal leather selection and 18-month warranty.

Leather strap longevity depends on tannage, usage frequency and exposure to atmospheric agents. A vegetable-tanned leather strap (alligator, shell cordovan or calf) maintains structural integrity for 4–6 years under moderate usage conditions with regular maintenance (cleaning and conditioning). Natural ageing (patina development) renders the strap increasingly attractive over time. For frequent diving use, synthetic materials (NATO, FKM rubber) guarantee indefinite durability.