Strap for Seamaster Aqua Terra 150M Master Co-Axial 38.5 Yellow Gold / Diamond / MOP

The lug width of the Omega Aqua Terra 231.58.39.21.55.002 is 20 millimetres. This dimension is specific to this reference and must be verified with a digital calliper by inserting the tool into the internal grooves of the lugs. A 22 millimetre strap would not install correctly.

Cognac alligator is the classic choice that enhances yellow gold by creating warmth continuity. Vegetable-tanned calf offers a natural patina over time. Shell cordovan guarantees superior durability with a mother-of-pearl lustre. For more sporty applications, rubber or military NATO emphasise the contrast with gold, creating a contemporary aesthetic.

Use a digital calliper to insert the tip into the internal grooves of the lugs, from one shoulder to the other. The measurement obtained represents the external width. In the case of the Omega Aqua Terra 231.58.39.21.55.002, the result will be 20 millimetres. It is the most reliable procedure and recommended before ordering a strap.

Yes, any quality artisanal strap made for 20 millimetre lug width is completely compatible. Our bespoke straps at Milano Straps are crafted with constructive precision identical to Omega standards, customisable in leather, colour, stitching thread and initials, with 18-month warranty.

A quality artisanal alligator or calf strap, with natural tanning, lasts an average of 3-5 years with daily use, developing a characteristic patina that enhances aesthetics. Shell cordovan exceeds 5-7 years. Durability depends on maintenance (avoid stagnant water), tanning type (vegetable surpasses chemical) and frequency of use. Casati Milano atelier offers regeneration and upgrade service.