Longines · HydroConquest
Strap for HydroConquest 32 Quartz Stainless Steel - Pink Gold / MOP / Bracelet
Takes 16 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Straps for the HydroConquest L3.370.3.89.6
Selected for the 16 mm lug width
The HydroConquest L3.370.3.89.6, seen from the bench
Frequently asked questions
What is the lug width of the Longines HydroConquest L3.370.3.89.6?
The Longines HydroConquest L3.370.3.89.6 features a lug width of 16mm, measured between the spring bars. This dimension is critical for selecting compatible aftermarket straps. To verify correct measurement, position a millimetre ruler perpendicular to the lugs and read the corresponding value at the attachment points.
Which strap is most suitable for the Longines HydroConquest L3.370.3.89.6?
For the L3.370.3.89.6, we recommend alligator straps (tobacco brown, navy blue or burgundy) for formal wear, vegetable-tanned calf leather for those desiring natural patination, and FKM rubber for sport and aquatic contexts. Alligator is the optimal choice because its natural grain texture contrasts elegantly with the brushed stainless steel case and preserves the visual balance of proportionality inherent to the 32mm diameter.
How do I change the strap on my Longines HydroConquest L3.370.3.89.6?
Strap replacement requires extracting the spring bars using a pin remover tool (readily available online). Position the tool beneath the bar and apply gentle pressure until it disengages; the bar will spring free. Align the new strap's perforation with the case's lug aperture, then reinsert the bar until you hear a distinct click of seating. If you lack confidence in manual operations, consult a professional watchmaker: the procedure requires three minutes and minimises the risk of case scratching.
Can I use an aftermarket compatible strap on the Longines HydroConquest L3.370.3.89.6?
Yes, provided the lug width is 16mm. Quality aftermarket straps (alligator, calf, rubber, NATO) are fully compatible. Ensure the attachment hole aligns precisely with the case's spring bar aperture. At milanostraps.it you will find a curated selection of 16mm straps ready for despatch, customisable in length, initials and thread colour, plus the option of bespoke commissioning via the Casati Milano atelier.
How long does a leather strap last on a Longines like the HydroConquest L3.370.3.89.6?
Leather strap longevity depends on tannage and usage intensity. Vegetable-tanned calf leather typically endures 3–5 years under daily wear, benefiting from the tannage's inherent durability. Alligator, being denser, exceeds 5–7 years. Exposure to humidity, perspiration and direct sunlight accelerates wear. Bespoke straps from Casati Milano carry an 18-month warranty and may be refurbished or replaced if deterioration results from manufacturing defect.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only

