Strap for Constellation Co-Axial 38 Stainless Steel / Red Gold / Blue Lozenge

The lug width of the Constellation 123.20.38.21.03.001 is 18 millimetres. This dimension is determined by the constructive geometry of the two-tone case and must be measured with precision between the inside of the two lugs using a digital calliper. Correct measurement ensures the strap adheres perfectly to the spring bars without lateral movement.

For this two-tone dress watch, straps in alligator (Mississippi or Himalayan) are ideal, as they complement the golden elegance of the case with regular texture and geometrically perfect grain. Alternatively, Shell Cordovan offers chromatic evolution over time and a deep patina that enhances the character of the watch. Vegetable-tanned leather remains versatile for formal daily contexts.

The Constellation 123.20.38.21.03.001 uses the standard spring bar system. Equip yourself with a dedicated tool (pin remover), gently lever the spring extraction hole, remove the spring bar and take off the old strap. Insert the new strap by aligning the holes with the lug ends, then reinsert the spring bar until you hear the locking click. Do not force: the movement should be smooth.

Yes, any strap with certified 18mm lug width is mechanically compatible. However, aesthetic compatibility requires attention: the two-tone rose gold and steel case communicates formality, so straps in alligator, Shell Cordovan or vegetable-tanned leather are semantically coherent. Sport straps (rubber, NATO) would be out of scale with the dress watch vocation of this model.

The lifespan of a leather strap depends on frequency of use, exposure to moisture and construction quality. A quality alligator or Shell Cordovan strap, used regularly (3-4 days weekly), maintains structural and aesthetic integrity for 4-6 years before requiring replacement. Prolonged exposure to body perspiration or rain accelerates ageing; maintenance with specific creams significantly extends useful life.