Strap for Seamaster Aqua Terra 150M Master Chronometer 34 Sedna Gold / Diamond / Snow Diamond / Alligator

The lug width of the 220.58.34.20.99.003 model is 16mm. This specification is essential when selecting compatible straps: a 14mm, 18mm, or 20mm strap will not fit correctly into the lugs. If you are unsure, contact Milano Straps with a photo of your watch on the wrist and our team will confirm the measurement before shipment.

Sedna Gold is Omega's proprietary alloy with rosy undertones that pairs ideally with vegetable-tanned alligator leather (grain texture that evolves over time), premium calf leather, or shell cordovan. Pure black is not recommended: prefer dark brown, cognac, bordeaux, or charcoal black. The gray-blue dial color also allows for navy blue or sand tones for summer wear.

The Aqua Terra features straight lugs (not angled). Using a dedicated tool or small flathead screwdriver, push the retaining clip toward the inside of the case to release the lug, then remove the old strap. Insert the new 16mm strap until it clicks into place. If you are not confident doing this yourself, Casati Milano offers strap replacement service at the atelier by appointment with access to the finest leather selection.

Yes, any aftermarket strap with a 16mm lug width is compatible with this model. However, construction quality varies significantly: Milano Straps offers straps made from premium Italian and French leather, hand-stitched and finished with artisanal craftsmanship. Always verify that the lug width is exactly 16mm and not 15.5 or 16.5mm, which are common market errors.

A premium quality leather strap subjected to daily use has a lifespan of 3-5 years before requiring replacement due to natural wear. Factors affecting longevity include: frequency of water contact (vegetable-tanned leather is more durable than calf), ambient humidity, direct sun exposure. Casati Milano provides an 18-month warranty on bespoke straps; to extend durability, we recommend alternating between at least two straps and occasionally applying neutral protective wax.