Strap for Constellation Co-Axial Master Chronometer 27 Stainless Steel / Yellow Gold / Silver Silk-Diamond

The lug width of the Constellation 127.20.27.20.52.002 is 17 mm. This dimension is standard for all 27 mm Constellation models and is essential for selecting compatible straps. The measurement should be taken between the spring bar pins, without adding any mounting thickness.

Alligator is the ideal formal choice, thanks to its natural grain and ability to capture light in harmony with the yellow gold case. For daily wear, vegetable-tanned calf offers superior softness and develops a fascinating natural patina over time. Silk NATO is a versatile alternative that reduces perceived weight and allows quick changes.

You will need a standard spring bar. Position the watch horizontally, support the case, then gently compress the spring bar from one side until it slides out of the pin. Repeat on the other side. Insert the new strap by first aligning one hole, then push the spring bar into the second hole until it clicks into place. The operation is reversible and requires no special tools.

Yes, provided the width is exactly 17 mm at the lug attachment area and the leather is sufficiently thin and flexible. The 27 mm Constellation has short lugs, so avoid rigid or excessively bulky straps. Choose soft leathers (calf, alligator, or silk NATO) to ensure optimal fit without uneven pressure on the case.

A high-quality leather strap lasts 3-5 years with daily use, provided proper maintenance is observed. Avoid excessive water exposure and let the leather dry naturally. Vegetable tanning ages beautifully, developing patina, while alligator maintains longer color stability. With the 18-month warranty from Casati Milano, you have full protection during the first critical adaptation period.