Strap for Classima Executives Automatic 42 Stainless Steel / Silver / Alligator

The lug width of the Baume & Mercier Classima 10333 is 18mm. This measurement represents the distance between the two spring bars (pins) that secure the strap to the case. It is essential to respect this dimension when selecting an aftermarket strap, as an strap with a different lug width will not install correctly and will compromise the aesthetic balance of the watch.

For the Classima 10333, we recommend noble and versatile materials: suede alligator in neutral tones (pearl grey, beige), vegetable-tanned calf leather in cognac, cream, or dark brown shades, or natural fabrics such as NATO straps in navy cotton or black. We advise against aggressive rubber sports straps, as the Classima is a dress watch and the strap should maintain a discreet and formal profile. Every choice should respect the chromatic balance between the stainless steel case and the wrist.

To change the strap, you must first remove the two spring bars (pins) that secure it to the case. Use a spring bar tool and insert the thin tip into the small lateral notch of the pin, lifting gently. Once the pins are removed, the original strap slides away from the lugs. To install the new 18mm strap, insert the pins through the ends of the strap and align the edges with the case lugs, pressing until you hear or feel the click of the spring bar locking into place. If you lack experience, consult a professional watchmaker to avoid damage.

Yes, you can use an aftermarket strap provided it strictly adheres to the 18mm lug width specification. Aftermarket straps available online and through Casati Milano have been specifically selected for this measurement. A quality aftermarket strap (vegetable-tanned leather, alligator, silicone rubber) not only fits perfectly but can also enhance the overall aesthetic of the watch whilst maintaining the original constructive balance.

The durability of a leather strap depends on construction quality, tanning method, and usage patterns. A good quality calf leather or alligator strap can last between 3 to 5 years with moderate use and proper maintenance (protection from excessive moisture, drying in case of perspiration, avoidance of abnormal creasing). Straps made with vegetable tanning tend to age elegantly, developing a natural patina over time. Casati Milano provides an 18-month warranty on all bespoke straps, ensuring constructive reliability and extended longevity.