Strap for Seamaster Aqua Terra 150M Master Chronometer 38 Stainless Steel / Blue / Rubber

The lug width is exactly 19 millimetres. This specification is stated in the reference code itself and corresponds to the internal distance between the lugs of the stainless steel case. It is advisable to verify with a digital calliper before purchasing a strap, although 19mm is invariable for this model.

The material depends on intended use: vegetable-tanned alligator is the most elegant choice and develops a natural patina with age; Italian calf leather offers a balance between daily versatility and refinement; black rubber is ideal for marine and humid environments; cotton NATO is practical and reversible. All are compatible with 19mm lugs and available online or by commission at Casati Milano.

The strap is connected via pins or bars: you need a removal tool (spring bar tool) to compress the lateral pins and extract them from the lugs. It does not require watchmaking skills, but it is essential to avoid scratching the stainless steel case. We recommend performing the operation on a soft surface (rubber mat or cloth). If you are not experienced, Casati Milano offers strap changes in the atelier by appointment.

All straps with 19mm lug width are compatible. Online you will find specialised collections at milanostraps.it, where the complete catalogue is available filtered for this size. Compatibility is guaranteed if the lug width is actually 19mm and the pins are standard (not proprietary). We recommend checking that the strap does not fit too tightly on the case lugs.

A strap in alligator or calf leather with vegetable tanning generally lasts 3-5 years of daily use, depending on climate and personal perspiration. Humidity and salt accelerate wear; regular maintenance (cleaning with a soft cloth, drying) extends durability. When the strap begins to show deep cracks or loses elasticity, it is time to replace it. Casati Milano offers an 18-month warranty on custom straps.