Strap for Seamaster Aqua Terra 150M Master Chronometer Small Seconds 38 Stainless Steel / Sand / Alligator

The lug width of the 220.13.38.20.09.001 model is 19.00mm. It is measured with a digital caliper between the two vertical pins of the case where the strap attaches. Always verify with precision ±0.1mm, as even minimal errors cause visible slack or excessive compression.

For the 220.13.38.20.09.001 we recommend black alligator or cognac brown for formality (patina evolves over time), shell cordovan for uniform aging, vegetable-tanned calf for daily versatility, cotton NATO for summer configurations. The choice depends on primary use: sartorial elegance or controlled sportiness.

Remove the original strap using a spring bar tool to compress the pins and slide them out from the case. Align the two 19mm pins of the new strap with the lug holes (19mm spacing), insert from one side applying light pressure, snap the second side into place. Verify that the strap is centered and symmetrical relative to the case.

Yes, all straps with 19mm lug width are compatible with the 220.13.38.20.09.001. Ensure the new strap has robust stainless steel 316L pins (spring bars) and that the case width (19mm) matches exactly. High-quality artisanal straps guarantee lasting compatibility without lug wear.

A premium artisanal leather strap (alligator, shell cordovan, vegetable-tanned calf) on an Omega with daily use lasts 3–5 years before showing significant aesthetic wear. With <a href="https://milanostraps.it/pages/termine-glossario/concia-vegetale">vegetable tanning</a> the patina improves over the years; alligator requires periodic water-repellent treatment. Casati Milano warranty covers manufacturing defects for 18 months.