Strap for Seamaster Aqua Terra 150M Master Chronometer Small Seconds 38 Sedna Gold / Diamond / Purple Jade / Bracelet

The lug width of the Omega Aqua Terra 220.55.38.20.99.001 is exactly 19 mm. This measurement is essential when purchasing a compatible strap: the strap's lug opening must fit perfectly between the two case lugs, with no lateral gaps and without forcing. You can verify the measurement using a digital caliper or flexible ruler, measuring the inner spacing between the two lugs.

For the 220.55.38.20.99.001 in Sedna Gold, we recommend three options in order of formal elegance: 1) Dark brown or black alligator, for maximum aesthetic compatibility with the Sedna Gold and Teak dial; 2) Vegetable-tanned calf leather in cognac or tobacco tones, for those who desire a patina that evolves naturally with use; 3) Japanese shell cordovan, for those who appreciate distinctive texture and exceptional durability. The choice depends on your personal style and intended use of the watch.

The strap is changed using a tool called a 'spring bar removal tool'. Insert the flat tip of the tool under the internal spring of the side lug, applying gentle pressure to create space, then remove the lug from the strap passant. Repeat the operation on the other lug. Next, insert the new strap's lugs into the case holes, ensuring they are fully locked. If you prefer to avoid the risk of scratching the case, you can entrust the operation to a professional watchmaker or our Casati Milano atelier.

Yes, you can mount an aftermarket strap provided it has a certified 19 mm lug width. The straps available on milanostraps.it have been validated for this specific measurement and offer construction quality superior to OEM Omega straps in many cases, thanks to the use of premium leather and artisanal finishing. Always verify strap lug width compatibility before purchase to avoid incongruence.

The lifespan of a leather strap depends on the tanning type and frequency of use: high-quality alligator lasts an average of 3-4 years with daily wear; vegetable-tanned calf lasts 2-3 years; shell cordovan can reach 5+ years thanks to its structural robustness. Constant exposure to moisture (sweat, rain) reduces lifespan, while storage in dry, cool environments prolongs it. The warranty offered by Casati Milano is 18 months, covering any construction or stitching defects.