Grand Seiko
Spring Drive SBGC204— lug 20mm

The lug width of the Grand Seiko Spring Drive SBGC204 is 20mm. This measurement is taken from the tip of the left lug tube to the tip of the right lug tube, and it ensures compatibility with any strap designed for this standard width. Accurate measurement is essential to guarantee a perfect fit on the wrist.

For the SBGC204 in rose gold, the ideal strap is alligator leather in brown or cognac tones, which complements the warm hue of the case. Alternatively, Italian vegetable-tanned calf leather develops a deep patina over time, creating aesthetic synergy with the ageing rose gold case. Japanese shell cordovan represents a formal and durable choice. FKM rubber remains the most versatile option for sports-oriented use.

The strap is changed by extracting the lug tubes from the case. A specialized tool (spring bar remover) is required to push the small metal spring positioned inside each lug tube. It is recommended to perform the operation on a soft surface (cloth) to avoid scratching the case. If uncertain, it is preferable to consult a professional such as Casati Milano atelier.

All straps with a 20mm lug width are compatible with the Grand Seiko Spring Drive SBGC204. In Milano Straps' catalogue you will find alligator, calf, shell cordovan, rubber and NATO fabrics, customizable in sizes and finishes. The important thing is to ensure that the strap is specifically designed for watches with standard 20mm lug tubes.

The lifespan of a leather strap depends on the type and usage. Alligator and shell cordovan, thanks to their fibrillar density, guarantee 3-5 years of daily use. Vegetable-tanned calf leather, being softer, requires rotation with other straps to extend its life to 2-3 years. FKM rubber has a longer lifespan (5-7 years) but lower aesthetic appeal. The 18-month warranty offered by Casati Milano covers manufacturing defects.