Strap for Constellation Co-Axial 38 White Gold / Diamond / Diamond

The lug width of the Constellation 123.55.38.20.99.001 is 18 millimetres. This measurement represents the perpendicular distance between the two spring bars that traverse the case lugs. It is essential to respect this exact measurement when purchasing a replacement strap to ensure both constructive and visual compatibility with the 38mm case.

For the white gold Constellation we recommend <a href="/pages/termine-glossario/alligatore">alligator</a> leather in dark brown or black: the structured texture of the skin coordinates naturally with the cold luminosity of white gold. <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a> is the premium alternative, with intrinsic lustre that amplifies gold reflections and exceptional durability. Vegetable-tanned calf is ideal for those seeking a unique patina that develops over time.

Strap replacement requires a specialised tool to remove the spring bars – the thin metal pins connecting the strap to the case lugs. Position the watch with the case facing downwards, locate the small lateral hole on each lug, insert the spring bar tool tip to push the pin outward. Once the lugs are released, slide off the old strap and insert the new one, listening for a click when the pins secure. For a white gold Constellation we recommend having a professional perform this operation to avoid scratching the case.

Yes, any strap with an 18-millimetre lug width is compatible with the Constellation 123.55.38.20.99.001. At milanostraps.it you'll find a dedicated collection of 18mm straps in premium leather (alligator, calf, shell cordovan) with customisation options. The Casati Milano atelier also creates bespoke straps with direct leather selection and sartorial finishing.

Leather strap longevity varies depending on material and usage. <a href="/pages/termine-glossario/alligatore">Alligator</a> and vegetable-tanned calf deliver 5-7 years of daily wear before aesthetic replacement becomes necessary. <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a>, thanks to its dense fibrous structure, can exceed 10 years of intensive use. Factors such as humidity, sun exposure and frequency of wear influence longevity. A well-maintained strap rotated with others extends useful life significantly.