Strap for Automatic Date Stainless Steel / Black / Bracelet

The Grand Seiko SBGR257 features a lug width of 20 mm, which is the distance between the two lugs on the case. This is the correct measurement for any compatible strap. To verify, observe the metal lugs on your case directly: the gap between them must correspond exactly to 20 mm. This standardised dimension facilitates simplified research among thousands of artisanal straps.

For this timepiece, we primarily recommend a high-quality alligator strap: the characteristic grain of the leather creates refined visual contrast with the brushed texture of the stainless steel case. Alternatively, a calf leather strap with vegetable tanning represents a conscious choice that ages organically, developing golden hues. For robust daily use, shell cordovan offers unrivalled density and natural brilliance.

The change is straightforward if you have the correct tools. Procure a spring bar tool kit and position the watch with the strap facing upwards. Insert the lever under the metal lug until you release the internal spring, withdraw the old strap, position the new one by aligning the hole with the lug, and let the spring snap back. Verify that the spring is fully inserted before wearing the watch. If uncertain, Casati Milano offers this service by appointment at their Milan atelier.

All straps with a 20 mm lug width are compatible with the SBGR257, regardless of brand. However, we recommend choosing artisanal straps of proven quality that respect the aesthetic of a timepiece in this category. Milano Straps offers a dedicated collection of 20mm straps crafted with premium leathers, customisable in colour, thickness and stitching thread according to your preferences.

Durability depends on frequency of use and leather quality. An alligator strap with vegetable tanning, worn daily, typically lasts 3–5 years before showing visible signs of ageing. Shell cordovan, due to its density, can exceed 5 years. In any case, superior quality leather does not deteriorate suddenly: it ages visibly, developing patina and hues that tell the story of your watch's use. Casati Milano guarantees its straps for 18 months against manufacturing defects.