Jaeger-LeCoultre
Reverso Q39334M6— lug 20mm

The lug width of the Jaeger-LeCoultre Reverso Q39334M6 is 20.00 mm. This dimension is standardised across all examples of this reference and is measured as the internal distance between the two case lugs. A compatible watch strap must have a width of exactly 20 mm to fit properly through the case lugs without play or friction.

The best strap depends on your intended use. For optimal aesthetic coherence, we recommend a high-quality alligator strap with traditional tanning—its natural grain texture dialogues elegantly with the satin finish of white gold. If you prefer a strap that develops patina over time, vegetable-tanned calf leather offers this narrative character. For daily versatility, a vulcanised rubber strap ensures moisture resistance and ease of maintenance without compromising the Reverso's elegance.

The strap is changed by removing the two spring bars that connect the strap to the case lugs. Use a dedicated spring bar tool, inserted perpendicularly to the bar's length, and apply gentle pressure until the bar slides outward. Next, align the new strap's holes with the spring bars and push the bar into position until it clicks. If you are not experienced, we recommend having a qualified watchmaker perform this operation to avoid damage to the lugs.

Yes, any high-quality strap with a 20 mm lug width is compatible with the Jaeger-LeCoultre Reverso Q39334M6. However, the strap must be constructed by a craftsman who understands the proportions of a 27.40 mm diameter watch. Generic or low-quality straps compromise both aesthetics and durability. Casati Milano's handcrafted straps are designed specifically for this reference, ensuring constructive coherence and material excellence.

The lifespan of a leather strap depends on frequency of wear, climate conditions, and material quality. A high-quality alligator or traditionally-tanned calf strap typically lasts 4–6 years with daily wear. If the watch is worn 2–3 times per week, durability can extend to 8–10 years. The leather develops a natural patina that improves its appearance over time, but mechanical wear on the spring bars eventually requires replacement. Regular maintenance—avoiding excessive moisture and drying the strap after rain—significantly extends overall lifespan.