Seiko
Prospex Divers SPB301— lug 20mm

The lug width of the Seiko Prospex Divers SPB301 is 20 mm. This is the precise measurement between the watch lugs where the strap must be inserted. You can verify this using a digital calliper or thickness gauge positioned perpendicular to the lugs.

It depends on primary use. For formal contexts, an alligator or vegetable-tanned leather strap enhances the watch's character. For underwater activities or summer use, NATO or rubber offer water resistance and durability. For daily balance, honey-toned calf leather combines aesthetics and functionality.

Changing the strap requires a spring bar tool to remove the connecting pins. Position the tool in the spring's groove, gently push until it retracts, then extract the strap. Align the new strap with the lugs and release the spring. If unfamiliar with the process, consult a professional.

Yes, all straps with 20 mm lug width are compatible. However, choose specialised makers who guarantee precise tolerances and construction quality. A poor-quality strap, even if it fits, can damage the watch's lugs over time.

With genuine vegetable tanning and moderate use, a leather strap lasts 3-5 years before showing evident wear. With regular care (periodic cleaning, natural wax conditioning), durability extends to 7-10 years. Constant exposure to water and perspiration significantly reduces longevity.