Strap for SUB 300 Divingstar / Bracelet

The lug width of the Doxa SUB 300 821.10.361.10 is 20mm, measured between the case lugs where the strap attaches. This measurement represents the standard for professional dive watches in this category and ensures broad compatibility with aftermarket artisan straps. To verify correctly, use a digital calliper positioned perpendicular to the longitudinal axis of the case, measuring the internal distance between the two lugs.

The choice depends on your intended use. For professional diving, we recommend natural rubber or silicone: they offer superior grip, rapid drying and chemical resistance to marine salts. For elegant daily wear, leather with vegetable tanning in mahogany or dark brown tones creates aesthetic harmony with the orange dial. NATO in nylon is the versatile and robust solution for operational environments. Alligator ensures breathability through its natural grain, ideal if you wear the watch in hot-humid climates.

Obtain a spring bar removal tool or contact a watchmaker. Position the watch with the strap facing upwards, locate the groove beneath each lug pin and insert the flat tip of the tool to lift the pin. Once free, the pin will release from the case: remove the old strap. Insert the new strap by aligning the holes with the case lugs, then reinsert the pins with gentle pressure until you hear a click. Verify that the strap is firmly secured before wearing the watch.

Yes, absolutely. Since the Doxa SUB 300 821.10.361.10 has a standard lug width of 20mm, it is compatible with any artisan or mass-produced strap fitted with 20mm pins. Milano Straps offers a dedicated collection of leather, NATO and rubber straps in this size, with customisation options: choice of colour, leather texture, buckle type, adjustable length. Always verify that the strap is explicitly compatible with 20mm before purchase.

A high-quality artisan leather strap (vegetable tanned, vegetable tannin-cured) typically lasts 18–36 months with intensive daily use. Durability depends on: frequent water contact, humidity, perspiration, UV exposure and maintenance. On a SUB 300 used for regular diving, salt water exposure accelerates wear (10–18 months). The leather weakens, fibres become frayed, the strap may rupture at the buckle point. To extend lifespan, dry the strap thoroughly after water contact, avoid prolonged direct sunlight exposure and consider rotating with secondary straps. A NATO or rubber strap lasts considerably longer (3–5 years), though it gradually loses elasticity.