Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Stainless Steel / Yellow Gold / MOP

The lug width of the Omega Constellation 131.20.29.20.55.002 is 18mm. This dimension corresponds to the distance between the lugs of the case and determines the compatibility of aftermarket straps. To verify visually, position a digital caliper between the inner shoulders of the lugs, avoiding external decorative details: you will obtain the precise value of 18mm.

For a Constellation 131.20.29.20.55.002 in yellow gold and steel with mother-of-pearl dial, we recommend tortoiseshell grey alligator or vegetable-tanned calf in cognac tones. Alligator offers intrinsic elegance and delicate grain; vegetable-tanned calf develops natural patina that evolves over time. Both materials maintain the jeweler-like identity of the watch and harmonize with the iridescent reflections of the dial without visually competing.

The strap is attached via spring bars to the lugs of the case. Use a specific spring bar tool (available online): rest one end on the elastic spring, press downward to release the bar from its seat, remove the old strap. Insert the new strap into the upper lug, position the bar and press until you hear the characteristic click indicating locking. Repeat on the other side. A simple operation if executed with attention to detail.

Yes, you can use aftermarket straps certified for 18mm lug width. Always verify that the strap has been tested for mechanical compatibility (lugs without excessive play) and that it respects the aesthetic proportions of the 29mm case. A high-quality alligator, calf, or shell cordovan strap will maintain the visual integrity of the watch, provided it is constructed with a deployant clasp and traditional stitching techniques.

Longevity depends on the material and usage. An alligator or shell cordovan strap, worn daily, maintains structural integrity for 4-6 years; vegetable-tanned calf shows visible wear (edge abrasion, micro-cracking) after 3-5 years of intensive use. Exposure to moisture, sweat and sunlight accelerates the process. A quality deployant clasp experiences less stress than ring-type clasps, extending the useful life of the complete strap-clasp assembly. Periodic maintenance (cleaning, conditioning) significantly extends durability.