Strap for Seamaster Aqua Terra 150m Co-Axial 43 Annual Calendar White Gold / Grey / Bracelet

The lug width of model 231.50.43.22.01.001 is 21mm. This dimension is specific and unique: every compatible strap must be constructed exactly for 21mm. Measure orthogonally the internal space between the two case lugs. No 20mm or 22mm strap will be compatible without risk of damage to the lugs.

For a 21mm lug width in white gold, dark brown alligator is the historic choice: the scale grain establishes tactile dialogue with the gold without competing. Shell cordovan (horse leather) in burgundy is bolder but works if dark and well-patinated. Vegetable-tanned calf in black is the sober solution that lets white gold be the absolute protagonist. Avoid NATO and rubber: they betray the nobility of the material.

The Omega Aqua Terra 231.50.43.22.01.001 is equipped with straight lugs without integrated spring-bar braces. Position the watch face-down on a soft pad, locate the small screws beneath each lug (one per side), unscrew with a watchmaker's screwdriver (do not apply excessive pressure to gold), remove the strap, position the new 21mm strap between the lugs, reinsert and screw with gentleness but firmness. If unsure, entrust it to a professional.

Any artisan strap constructed for 21mm lug width is compatible with your Aqua Terra. On milanostraps.it you will find a collection of 21mm straps customizable in material (alligator, cordovan, calf), color, initials, and stitching thread. Important: always verify that the supplier specifies 21mm in the technical specifications.

A quality alligator strap with well-constructed attachments lasts 3-5 years with moderate daily use. Shell cordovan, more compact and naturally oily, can extend to 5-7 years. Vegetable-tanned calf is less predictable: it depends on personal perspiration, ambient humidity, cleaning frequency. With 18-month warranty and maintenance (monthly cleaning with a damp cloth), deterioration becomes gradual and visible, not sudden.