Strap for Seamaster Aqua Terra 150M Hand Wound 49.2 XXL White Gold / White

The lug width of the 231.53.49.10.04.001 is 20mm. This dimension represents the internal distance between the two lugs of the case where the strap is attached. The watchmaking standard allows a tolerance of ±0.15mm. Always verify with a digital caliper before purchasing an aftermarket strap to avoid physical incompatibility.

Alligator represents the most conservative and harmonious choice with white gold: its natural geometric grain does not compete with the precious finishing. Alternatively, English vegetable-tanned calf offers natural aging that accumulates character over time. FKM rubber remains the most versatile solution for transitions between formal and informal contexts while maintaining aesthetic coherence.

To change the strap you need spring bar tools, small pressure instruments that allow you to release the lugs from the case. Position the tool in the lateral grooves of the case, press lightly to compress the lug, then remove the old strap. Insert the new strap by aligning the lugs to the respective grooves. If you lack experience, entrust the task to a professional to avoid scratches on the white gold case.

All straps with a 20mm lug width are compatible. On milanostraps.it you will find a selection of handcrafted straps in alligator, calf, shell cordovan and rubber, customizable in color, initials and stitching thread. The Casati Milano atelier also offers a bespoke service with direct consultation and custom realization with an 18-month warranty.

The duration varies based on material and usage. A vegetable-tanned calf lasts an average of 3–5 years with daily wear, developing a patina that improves over time. Alligator is more resistant and can last 5–7 years. FKM rubber has a longer lifespan (7–10 years) but requires regular cleaning. Seasonal rotation among different straps significantly extends the life of each piece and allows aesthetic variety.