Strap for Classima Executives Automatic 39

The lug width of the Baume & Mercier Classima 8837 is 18mm. This measurement is essential for selecting compatible straps: measure the distance between the two horizontal pins that support the strap on the case. Any aftermarket strap must respect exactly 18mm width at the ends to ensure perfect fit and respect of the original proportions.

For the Classima 8837, alligator is the most natural choice: its regular grain and satin colour convey luxury without ostentation. Alternatively, vegetable-tanned leather offers patina and softness over time with tones that evolve nobly. For summer practicality without compromise, fine-structured rubber is underrated: it absorbs body heat and maintains the watch in a sport-elegant dimension. NATO straps are not recommended as the visual bulk alters the geometric proportions of the 39mm case.

The Baume & Mercier Classima 8837 strap is changed using a specialised tool (spring bar tool). Locate the two horizontal pins at the ends of the case: insert the small hook of the tool under the pin, apply gentle downward pressure and the pin will partially retract. Then remove the old strap. To insert the new one, align both ends with the pins and press until they click into place. If you lack experience, consult a professional watchmaker: the risk of scratching the case is real.

Yes, the Classima 8837 is compatible with any 18mm-width strap. Milano Straps offers a wide collection of 18mm straps specially selected for this model: alligator, calf, rubber—all ready for dispatch and customisable in sizes, initials and stitching colour. The Casati Milano atelier also creates made-to-measure straps for those seeking a complete sartorial experience with personal leather selection and an 18-month guarantee.

Longevity depends on the leather type and usage. High-quality alligator, with robust patina, resists 4–5 years of daily wear without replacement. Vegetable-tanned calf has similar longevity, but its initial softness tends to diminish over time (the normal evolution of vegetable leather). Rubber, a modern material, has a lifespan of 3–4 years before texture begins to degrade. Milano Straps supplies straps built to decisive thickness standards (3–4mm main leather) to guarantee longevity and visual stability on the wrist.