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

The lug width of model 220.13.38.20.60.001 is 19 millimetres. This is the distance between the internal suspension pins of the case. Precise measurement is essential: do not confuse with alternative standards such as 18mm or 20mm. Use a digital calliper to verify the measurement between the pins.

The choice depends on use and personal style. For formal elegance: dark brown or black alligator with vegetable tanning, which develops a natural patina over time. For everyday versatility: soft-textured calf in cognac or burgundy tones. For those who appreciate noble materials: shell cordovan with traditional tanning, which transforms over time creating a unique patina. For the weekend: NATO in navy blue nylon, faithful to Seamaster origins. All these straps are available in 19mm size for your watch.

Strap replacement requires a spring bar tool: a thin steel instrument with a slightly curved tip. Position yourself in a well-lit environment. Insert the tool into the small space between the case lug and the pin, gently push downward to compress the pin's internal spring, and extract the pin from the lug. Repeat on the other side. Once free, install the new strap by aligning the pins in the lug holes and pressing until you hear a click. Do not force: the pin must click naturally into place.

Yes, but with care. The prerequisite is that the strap is compatible with the 19 millimetre lug width. Brands such as Hirsch, Barton, Stub & Welt, and artisanal specialised productions like Casati Milano offer straps in this size. Always verify the technical specifications before purchase. Straps of quality comparable to Omega guarantee softness, longevity and aesthetics consistent with your watch.

Durability depends on material and use. Alligator with vegetable tanning: 4-6 years if worn daily, developing a fascinating patina. Standard calf: 3-4 years with regular use. Shell cordovan: 5-7 years, with aesthetic improvement over time. All straps require maintenance: avoid direct and prolonged sun exposure, do not wet unless necessary, and occasionally apply leather balm. The Casati Milano atelier provides 18-month warranty on artisanal straps and personalised advice for extending material life.