Strap for Prospex Diver SLA017J1 Stainless Steel / Black

The Seiko Prospex Divers SLA017J1 is fitted with a 19mm lug width, which is the distance between the two lugs where the strap attaches to the case. This measurement must not be confused with the lug width itself, which on the SLA017J1 is approximately 20mm. To ensure a perfect fit without lateral play, it is essential to select a strap exactly 19mm in width.

The choice of strap depends on intended use and aesthetic preferences. For formal and daily wear, alligator in vegetable tanning in deep brown offers elegance and durability; vegetable-tanned calf is the most versatile solution, tolerating moisture and water contact. For a more tool-watch character, a navy NATO strap emphasises the diving vocation. If the watch is intended for frequent diving, natural rubber or fluorocarbon guarantees maximum water resistance.

Changing the strap is a straightforward operation requiring a specific tool: a spring bar tool or small flat-head screwdriver. Position the watch on a soft surface. Insert the tool tip into the small hole under the lug and gently push outward to release the spring bar. The old strap will detach. Align the new strap with the lugs and press until you hear a click. Repeat on the other side.

Yes, the SLA017J1 is compatible with any quality 19mm aftermarket strap that respects industrial standards. Leather, NATO, rubber and synthetic straps are available from specialist retailers such as MilanoStraps. The important thing is to verify that the lug width is exactly 19mm and that the quality of stitching and materials is consistent with the watch's dignity.

The durability of a leather strap depends on leather quality, tanning method and usage. High-quality alligator or vegetable-tanned calf lasts between 3 and 7 years of daily wear with regular maintenance. If frequently exposed to water, lifespan reduces to 2-3 years. Leather develops a natural patina that evolves over time, increasing aesthetic appeal but also requiring occasional cleaning. A leather strap is not a permanent component, but a consumable element that contributes to the tactile experience of the watch.