Grand Seiko
Mechanical SBGR305— lug 20mm

The Grand Seiko Mechanical SBGR305 features a lug width of 20 millimetres, measured between the internal edges of the lugs that attach to the case horns. This measurement ensures compatibility with the entire range of bespoke straps available online and through Casati Milano atelier.

For the SBGR305, we recommend a vegetable-tanned alligator strap or brushed calf leather, which reflect the minimalist philosophy and pursuit of aesthetic perfection embodied by the timepiece. A shell cordovan strap represents the ultimate expression of accessible luxury, whilst NATO or elastomer options are ideal for sporting use. Your choice should reflect your lifestyle and the patina development you wish to achieve over time.

Changing the strap on a Grand Seiko is straightforward and requires no specialised tools. The lugs attach laterally to the case: simply insert the new strap into the lateral housing slots until it clicks into position. We recommend performing this operation on a flat surface whilst protecting the case with a soft cloth to prevent scratching.

Yes. The 20mm straps available on milanostraps.it are manufactured to international compatibility standards and are guaranteed to fit correctly on all watches with 20mm lug widths, including the SBGR305. We recommend verifying the lug width of your specific model prior to purchase.

A high-quality artisanal leather strap, treated with vegetable tanning, typically lasts 3–5 years with daily wear. Longevity depends on frequency of use, exposure to moisture, and maintenance care. Casati Milano atelier provides an 18-month warranty on all bespoke straps, with the option of future restoration and adjustment services.