Longines
Conquest Heritage L1.649.4.92.6— lug 19mm

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.

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.

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.

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.

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.