Strap for Classima Executives

The lug width of the Classima 8789 is 18 millimetres. This measurement represents the internal distance between the two case lugs and is critical for strap compatibility. It is important to measure this dimension correctly using a calliper or millimetre ruler, positioning the tool perpendicularly to the lugs from their internal points. An 18mm strap will fit perfectly to this model, ensuring harmonious proportions with the case's 39mm diameter.

For a Classima 8789 in rose gold, cognac-toned alligator is the classical choice that emphasises the rosy tones of the case. However, vegetable-tanned calf leather offers a more contemporary elegance and develops a natural patina over time. If you desire everyday versatility, a dark blue or black rubber strap allows you to transform the timepiece from formal occasion to robust daily companion. Shell cordovan, whilst rare, represents the most sophisticated solution for those who appreciate materials with inherent character and memory.

Changing the strap on a Classima 8789 requires a specialised tool called a spring bar tool or lug remover. Position the watch on a soft surface, locate the lug shoulders (the small lateral protrusions on the case), and apply the spring bar tool to the bar connecting the lug to the strap. Press gently to extract the bar completely, then remove the old strap. Insert the new strap by aligning the holes and push the bar until you feel it click into place. Verify that the strap is securely fastened by gently pulling on both sides.

Yes, any strap manufactured to the international 18mm standard is compatible with the Classima 8789, regardless of the manufacturer. Physical compatibility is guaranteed by the standardised lug width. However, to maximise aesthetic quality and durability, it is advisable to choose straps crafted from noble leathers and artisanal construction that respect the harmonious proportions of the original case and develop a patina consistent with the prestige of the timepiece.

The lifespan of a leather strap depends on usage and maintenance. A high-quality alligator strap with vegetable tanning can last 5–8 years with moderate daily use. Vegetable-tanned calf leather tends to have similar longevity, sometimes slightly less due to the lesser robustness of the fibres. Shell cordovan straps, owing to the natural density of the fibre, can exceed 10 years. To extend durability, avoid prolonged exposure to moisture and direct sunlight, and periodically apply protective creams specifically formulated for leather. The 18-month warranty from Casati Milano atelier covers manufacturing defects, not natural material wear.