Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Sedna Gold / Snow

The lug width of model 131.58.29.20.99.001 is 18mm. This measurement represents the distance between the case lugs and is essential for selecting the correct strap. It is important to manually measure your watch before purchase, positioning the strap fully and checking with a caliper the internal distance between the lugs, to rule out any construction variations.

For the 131.58.29.20.99.001, we recommend alligator with vegetable tanning, which enhances the aesthetic contrast of the Sedna Gold case. If you prefer formal elegance, smooth calf in brown or bordeaux tones perfectly complements the colour of the alloy. For those who appreciate natural ageing, shell cordovan develops a deep patina that amplifies the visual richness of Sedna Gold over time. Rubber remains the ideal choice for daily and practical use.

To change the strap, remove the watch from your wrist and place it flat on a soft surface. Locate the spring bars that connect the case to the lugs: they are generally held in place by internal springs. Using a dedicated tool (spring bar tool) or a fine-pointed implement, gently press the internal spring to release the pin from one side, then remove the old strap. Insert the new strap by aligning the spring bar with the case holes, making sure it fits perfectly on both sides. If you are not experienced, consult a qualified watchmaker.

Yes, model 131.58.29.20.99.001 accepts all straps with an 18mm lug width. A high-quality artisanal aftermarket strap – made in alligator, vegetable-tanned calf, or shell cordovan – does not compromise the watch's value if chosen with aesthetic awareness. Avoid low-quality synthetic leather straps or those with poor finishing: the contrast with the sophistication of the case would be evident.

Longevity depends on the material and use. A quality alligator or vegetable-tanned calf strap with precise stitching lasts 4–6 years with moderate daily use, developing a desirable patina in the first year. Shell cordovan, thanks to its natural density, can last 6–8 years while maintaining structure. Factors that reduce durability: constant exposure to humidity, salty sweat, extreme temperatures, excessive stretching. A rubber strap lasts 3–5 years. Casati Milano's 18-month warranty ensures replacement for manufacturing defects within 12 months of moderate use.