Grand Seiko
Spring Drive SLGA007— lug 20mm

The lug width of the Grand Seiko Spring Drive SLGA007 is 20 millimetres. This measurement is fixed and determined by the case geometry: the lugs are integrated into the structure and do not allow variations. When ordering a replacement strap, ensure it is specifically manufactured for 20mm lug width.

The ideal strap depends on intended use and personal taste. For a classic-elegant approach, alligator or shell cordovan are traditional choices: their natural texture dialogues perfectly with the case finishing. For informal contexts, a NATO in heavy cotton or vulcanised rubber offers practicality. Vegetable-tanned calf leather represents the compromise between elegance and versatility, with a surface that ages naturally and develops character.

The strap is secured to the lugs via spring bars. To remove it, use a strap-changing tool (an implement with two hollow tips): position the tips against the internal pin and press upwards to release the pin from its seat. Once the lugs are free, slide off the old strap and insert the new one by aligning the holes. Reinsert the pins evenly from both sides. If you lack the tool, entrust the work to a watchmaker: the operation takes minutes and costs very little.

Yes, any strap with a 20mm lug width is compatible. However, construction quality varies significantly: hand-stitched full-grain leather straps, finished with care, guarantee durability and aesthetic ageing superior to industrial alternatives. Priority: always verify that the strap is calibrated precisely to 20mm and that the supplied spring bars are compatible with the watch's lugs.

Durability depends on frequency of use and leather quality. A shell cordovan strap can last 5-7 years with daily wear, thanks to its superior fibre density. Quality alligator or calf have an average lifespan of 3-5 years. Crucial factors: exposure to sweat and humidity (accelerate wear), regular maintenance (brushing and occasional treatment with specific creams), and proper drying after water exposure. Many collectors own multiple straps and rotate them, thereby extending the useful life of each one.