Grand Seiko
Spring Drive SBGA290— lug 20mm

The lug width of the SBGA290 is 20mm. This standardised dimension allows the use of aftermarket straps compatible with the vast majority of contemporary high-end watches. Measurement is performed by removing the original bracelet and calculating the linear distance between the two terminals of the case.

For a yellow gold SBGA290, we recommend straps in medium brown alligator, vegetable-tanned calf with cognac tone, or shell cordovan. Alligator offers maximum elegance, vegetable-tanned leather develops a patina that evolves over time, whilst shell cordovan emphasises natural lustre. All these 20mm materials are available both in stock and bespoke through the Casati Milano atelier.

To change the strap, you will need a spring bar tool. Insert the tool gently under the elastic pin connecting the bracelet to the case, lift slightly to free the internal spring, and remove the pin. Next, position the new strap by aligning its ends with the lug holes (20mm) and reinsert the pin, ensuring the spring clicks correctly into place. This operation requires precision; we recommend having it performed by a specialist workshop if you lack experience.

Yes, any strap with a 20mm lug width is geometrically compatible with the SBGA290. However, the choice of the strap's construction quality remains critical: poor material or imprecise stitching would compromise the aesthetic balance of a watch in this category. We recommend choosing artisanal straps from specialist suppliers, where construction is manually controlled and building details (leather thickness, thread, deployant clasp) reflect haute horlogerie standards.

The durability of a leather strap depends on use and care. On an SBGA290 worn daily, a high-quality strap (alligator, calf, shell cordovan) maintains structural integrity for 3-5 years. Vegetable-tanned leather develops a fascinating patina within 6-12 months of regular use. To extend the life of the strap, it is advisable to alternate with other straps, avoid prolonged exposure to moisture, and occasionally apply specific leather conditioners. The Casati Milano atelier offers an 18-month guarantee on all artisanal straps, with the possibility of regeneration and restoration.