Omega
Constellation 131.55.34.20.61.001— lug 21mm

The Omega Constellation 131.55.34.20.61.001 has a lug width of 21 millimeters. This measurement represents the internal distance between the two lugs (the vertical passageways of the case). To verify strap compatibility, measure this distance perpendicularly with a caliper; a 21mm strap will fit with precision without forcing.

For this precious Sedna Gold case, we recommend alligator or shell cordovan in warm tones (brown, cognac, burgundy). Alligator complements the sunburst pattern of the dial, while shell cordovan develops a patina that naturally accompanies the aging of rose gold. Vegetable-tanned calf leather represents a versatile and more aesthetically neutral alternative.

The strap is replaced by removing the spring bars that pass through the lugs. Use a dedicated spring bar tool to compress the internal spring of the bar, extract it from the case, remove the old strap, and insert the new one by aligning the eyelets to the lugs. Always verify the correct positioning of the springs before wearing the watch.

Yes, any strap with a certified 21mm lug width is compatible with the 131.55.34.20.61.001. However, to preserve the value and aesthetics of a luxury Sedna Gold watch, we recommend superior quality leathers (genuine alligator, shell cordovan, fine-grained calf) rather than synthetic or low-quality straps.

The lifespan depends on leather quality and usage conditions. A top-quality alligator or shell cordovan strap, with regular maintenance (hygiene, protection from excessive moisture), offers 3-5 years of daily wear before requiring replacement. Vegetable-tanned calf leather typically lasts 2-3 years. The Casati Milano atelier offers straps with an 18-month guarantee and can assist you with maintenance.