Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Stainless Steel / Silver

The lug width is 18 millimetres. This measurement is taken by positioning a ruler on the top of the case, from shoulder to shoulder (external-external), where the strap is inserted. This is a dimension that requires specific and tailored straps, so it is important to always verify this compatibility before ordering.

For the 29mm Constellation we recommend black or dark brown alligator, which creates sharp contrast with the brushed steel and completes the compact proportion of the case. A vegetable-tanned calf leather in cognac represents a more dynamic alternative capable of developing visible patina over time. For casual contexts, a navy blue NATO maintains sobriety while adding versatility.

The strap is changed by removing the spring bars that connect the case lugs. Proceed with dedicated tools (spring bar extractor) to avoid damage: gently insert the extractor under the spring bar, apply controlled pressure until it retracts, then remove the old strap. Insert the new strap by aligning the holes with the spring bars, press until they engage on both sides. If you are not experienced, contact a specialised workshop.

Yes, provided they are 18mm compatible straps. Quality artisanal aftermarket straps (made from alligator, calf or vegetable-tanned leather) represent an ideal solution because they allow customisation in colour, texture and length. Always verify that the spring bars are the correct size (usually 18mm) and made of stainless steel for compatibility with the steel case.

A quality leather strap (alligator, vegetable-tanned calf) typically lasts 18–24 months with daily use, subject to perspiration, mechanical wear and sun exposure. Vegetable-tanned leather develops patina but becomes more fragile over time. Alligator, due to its fibrous structure, tends to last longer. The 18-month warranty offered by Casati Milano artisanal straps covers manufacturing defects, not natural wear.