Milano Straps
← Longines

ITENDEFRES

SearchCart
Menu

Longines · HydroConquest

Strap for Longines HydroConquest L3.696.4.13.6

The Hydroconquest Chronograph L688 takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Longines
Not sure about the right strap, or can't find your watch?Message me on WhatsApp
Lug width20 mm
Case diameter41 mm
ReferenceL3.696.4.13.6 (aka: L36964136)
FamilyHydroConquest
MovementLongines caliber L688.2 Hours, Minutes, Small seconds | Date | Chronograph, Column wheel
Year2013
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

View →

What I'm asked about the Longines HydroConquest L3.696.4.13.6

What strap size does the Longines HydroConquest L3.696.4.13.6 take?

The Longines HydroConquest L3.696.4.13.6 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the Longines HydroConquest L3.696.4.13.6 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the Longines HydroConquest L3.696.4.13.6?

Yes, in 20 mm leather, as long as you don't wear it in the water: leather doesn't like the sea or the pool. For days in the water, rubber. On a 41 mm diver I go for a full-thickness strap, not a thin one.

Which strap do you recommend for the Longines HydroConquest L3.696.4.13.6?

Rubber if you wear it in the water; otherwise a 20 mm calf strap, full thickness. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

Straps for the HydroConquest L3.696.4.13.6

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

Frequently asked questions

Are compatible aftermarket straps available for the Longines HydroConquest L3.696.4.13.6?

Yes, any strap with a 20 mm lug width is compatible. Milano Straps offers artisanal leather straps in 20 mm ready for shipment, customisable in size, initials and thread colour. For bespoke tailored experience, the Casati Milano atelier creates custom straps with personal leather selection, WhatsApp consultations and 18-month warranty.

What is the lifespan of a leather strap for the Longines HydroConquest L3.696.4.13.6?

Durability depends on use and tanning method. An Italian calf strap with vegetable tanning lasts 18–24 months under daily wear, developing natural patina. Natural alligator offers 2–3 years lifespan thanks to denser structure and lower humidity sensitivity. Shell cordovan provides longevity up to 4–5 years with light maintenance. Vulcanised rubber matches alligator durability without patina formation. Factors including humidity exposure, bathing frequency and preventive maintenance significantly impact strap lifespan.

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

The atelier's website: casatimilano.com