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

The lug width is 20 mm. This dimension must be measured precisely between the two spring bars: it represents the width of the spring mechanism, not the total distance. Even a minimal deviation (0.5 mm) can compromise the strap stability on the case.

Vegetable-tanned alligator remains the historic choice for this collection: the scales create a three-dimensional texture that dialogues with the teak-deck dial, while the natural patina reflects the warmth of red gold. Alternatively, Hermès-style calf leather in warm tones (burgundy, cognac) offers elegance without aesthetic competition with the precious metal.

The procedure requires a dedicated tool (spring bar tool). Position the flat end of the tool in the spring bar groove, press gently inward to remove the spring, take off the old strap. Insert the spring into the new strap (aligning the holes), reposition the tool in the groove and press until you hear a click. If you are not experienced, you can request the strap change at an atelier with personal supervision.

Yes, provided it is certified for 20 mm lug width. Artisanal quality leather straps (alligator, shell cordovan, calf) offer aesthetic and comfort advantages over the original integrated bracelet. Always verify that the spring bar is the same or compatible (1.2 mm internal diameter, ISO standard).

A quality alligator or calf strap with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> has an average lifespan of 3-5 years with daily use and ordinary maintenance (cleaning with a damp cloth, protection from excessive moisture). Shell cordovan, thanks to its superior fibrous density, can reach 6-8 years. Stitching replacement (more frequent than leather wear) costs significantly less than a new strap.