Grand Seiko
Spring Drive SBGD001— lug 20mm

The lug width of the Grand Seiko SBGD001 is 20mm. This measurement is structural and non-negotiable, engineered by Seiko to maintain the visual balance of the 43mm case. Correct measurement is performed with a digital calliper positioned perpendicular to the case, from the spring bar attachment hole to the contact point on the case.

For a platinum 950 timepiece such as the SBGD001, we recommend straps in Nile alligator (black or dark brown), vegetable-tanned calf with fine grain, or shell cordovan in burgundy or mahogany. These materials respect the constructive nobility of the watch and develop natural patina over time, which enhances quality perception.

Strap change is performed using a spring bar remover or removal tool. Position the tip under the spring bar, gently press to compress the spring, then extract the end from the case seat. Repeat on the other side. Insert the new strap by aligning the hole with the spring bar, then press until it clicks into place. For watches of this calibre, professional assistance is recommended if this is your first time.

Yes, a wide selection of 20mm straps compatible with the Grand Seiko SBGD001 is available online, ready for dispatch. Milano Straps offers personalisation in sizing, initials and choice of stitching thread. For a bespoke experience, the Casati Milano atelier creates custom straps with personal leather selection and 18-month warranty.

A quality leather strap (alligator, calf, shell cordovan) subjected to regular wear has an average lifespan of 3-5 years before replacement is required. Longevity depends on intensity of use, ambient humidity and maintenance. Periodic cleaning with a soft cloth and avoidance of prolonged immersion significantly extend strap life. The patina acquired over time is a virtue, not a defect.