Strap for Constellation Co-Axial 38 Stainless Steel / Yellow Gold / Silver

The lug width of the Constellation 123.20.38.21.52.002 is 18 millimetres. This measurement is taken between the two inner shoulders of the lug using a calliper, positioned perpendicularly to the case. It is essential to verify this before ordering a replacement strap to avoid mounting incompatibility.

For a two-tone Constellation, alligator represents the choice of maximum aesthetic balance: the anatomical grain naturally dialogues with both tones of the case. A cognac brown or polished black creates a harmonious contrast. Alternatively, vegetable-tanned calf offers versatility and ages elegantly, while shell cordovan remains the choice for formal evening wear. Structured rubber remains ideal for aquatic environments.

The strap is changed using a spring bar tool: position the tip of the tool under the metal pin connecting the strap to the lug, push lightly to compress the internal spring, then slide the pin outward. Repeat on the other side. Insert the new strap by sliding the pins into the lug holes until the locking click. A simple operation, but if uncertain, consult a watchmaker.

Yes, any strap with an 18 millimetre lug width is compatible with your Constellation 123.20.38.21.52.002. The spring bars must have a standard diameter of 1.8 millimetres. Before purchase, always verify the manufacturer's technical specifications to rule out anatomical variants or non-standard loops.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3-5 years with daily wear, depending on variables such as climate, frequency of use, and maintenance. Constant exposure to sweat and atmospheric agents accelerates ageing. FKM rubber or NATO straps have comparable lifespans but less aesthetic degradation. Milano Straps guarantees 18 months on artisanal craftsmanship, but actual longevity depends on your wearing habits.