Longines · Conquest Heritage

Strap for Conquest Heritage 38 Stainless Steel / Blue / Bracelet

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width19 mm
Case diameter38 mm
ReferenceL1.649.4.92.6
FamilyConquest Heritage
MovementLongines caliber L888.5 ND Hours, Minutes, Seconds | Chronometer
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

The Conquest Heritage L1.649.4.92.6, seen from the bench

The Longines Conquest Heritage L1.649.4.92.6 is a 38 mm stainless steel watch representing the heritage of Swiss chronometry in diving and professional exploration. It features the Longines caliber L888.5 ND automatic movement with Chronometer certification, ensuring precision within ±4 seconds per day. The case offers 100 meters water resistance, while the 19 mm lug width reflects the proportional design of 1950s specifications and is critical for proper strap fitment without lateral movement or gaps.

Frequently asked questions

What is the lug width of the Longines Conquest Heritage L1.649.4.92.6?

The lug width is precisely 19.00 mm. This dimension must be respected rigorously: straps of 18.5 mm are too tight, whilst 19.5 mm straps create irregular gaps. Measurement should be taken internally between the case lugs.

What is the best strap for the Longines Conquest Heritage L1.649.4.92.6?

This depends on use and climate. Natural alligator with vegetable tanning offers structural rigidity and reduced moisture absorption, ideal for temperate climates. Vegetable-tanned calf develops a unique patina over time, complementing the brushed case. For water use, an FKM rubber strap honours the model's historical diving heritage.

How do I change the strap on my Longines Conquest Heritage L1.649.4.92.6?

The strap is secured to the case via two spring bars. Use a spring bar tool to gently lever one side of the case, removing the spring bar from its seat. Extract the old strap and align the new one's holes with the spring bars. Reposition the spring bar in the opposite seat. Repeat on the other side. Avoid forcing to prevent case damage.

Can I use an aftermarket strap on my Longines Conquest Heritage L1.649.4.92.6?

Yes, it is fully compatible. A custom-made 19 mm aftermarket strap actually delivers superior results to original equipment: you can select the material (alligator, calf, shell cordovan, rubber), colour and even clasp type. A specialist atelier like Casati Milano offers advanced personalisation with an 18-month warranty.

How long does a leather strap last on the Longines Conquest Heritage L1.649.4.92.6?

A strap crafted from superior leather (alligator, vegetable-tanned calf, shell cordovan) typically lasts 5-7 years with intense daily use, longer with periodic wear. Longevity depends on climate (humidity accelerates deterioration), tanning quality and maintenance. A well-preserved strap, protected from excessive moisture and periodically brushed, can last up to 10 years. A professional atelier can restore your strap after 5 years by replacing the clasp and reconditioning the leather.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only