Longines · Les Grandes Classiques
Strap for Prestige Gold
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 Les Grandes Classiques L6.109.6.15.6 (aka: L61096156)
Selected for the 16 mm lug width
The Les Grandes Classiques L6.109.6.15.6 (aka: L61096156), seen from the bench
Frequently asked questions
What is the lug width of the Longines Les Grandes Classiques L6.109.6.15.6?
The lug width is 16mm. This measurement is specific to this series and must be respected with millimetric precision to ensure compatibility and aesthetic balance of the timepiece. You can verify it by measuring with a digital calliper the distance between the lug pins, from the left interior contact point to the right interior contact point. Compatible straps are available in our 16mm dedicated collection.
What is the best strap for the Longines Les Grandes Classiques L6.109.6.15.6?
For this watch we recommend black or dark brown alligator for maximum formality, or shell cordovan if you desire a leather that ages with grace and visible patina development. Vegetable-tanned calf is a sustainable and modern alternative, whilst black rubber offers ideal versatility for daily wear without compromising formal aesthetics. The choice depends on your usage context and personal preference regarding leather texture and patina evolution over time.
How do I change the strap on my Longines Les Grandes Classiques L6.109.6.15.6?
The lug pins are typically 1.3-1.5mm in diameter. Use a dedicated spring bar removal tool, insert it perpendicularly to the pin and apply controlled pressure to extract it from the lug seats. The new strap must slide in without force; if it does not enter smoothly, verify that the width is exactly 16mm. For watches of this value, we recommend having the operation performed by a specialist watchmaker to avoid damage to the yellow gold case.
Can I use an aftermarket strap on this Longines?
Yes, provided it respects the construction specifications: 16mm lug width, pin diameter 1.3-1.5mm, and preferably material quality consistent with the dignity of the yellow gold case. We advise against generic or questionable-origin straps; an artisanal strap in fine leather (alligator, shell cordovan, vegetable-tanned calf) maintains the perceived value of the watch and guarantees tactile comfort and durability over time.
How long does a leather strap last on a Longines Les Grandes Classiques?
Durability depends on leather quality and intensity of use. A high-quality artisanal strap in alligator or shell cordovan lasts 3-5 years of daily wear before significant wear appears. Vegetable-tanned calf tends towards 2-3 years under the same usage regime. A rubber strap resists longer (5-7 years) but gradually loses elasticity. Environmental factors (humidity, sun exposure, perspiration) accelerate ageing. Periodic maintenance with specific hydrating creams extends useful life by 12-18 months.
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

