Strap for SUB 300T Searambler / Bracelet

The Doxa SUB 300 840.10.021.10 features a 20mm lug width. This measurement is standard for mid-to-large sized wristwatches and is compatible with a broad range of artisan leather, rubber, and NATO textile straps. Always verify the lug width specification before purchasing an aftermarket strap.

The Doxa SUB 300 pairs exceptionally well with vegetable-tanned leather straps for classical dress wear, alligator straps for sartorial elegance, or vulcanised rubber and NATO textile straps for professional diving and sports applications. Given the tool watch ethos, we recommend straps fitted with deployante safety clasps to maintain stability during underwater operations. Milanese artisan straps stand out for leather grain refinement and precision hardware alignment.

Use a spring bar tool to remove the existing strap. Position the tool near the spring bar terminus, compress downward, and extract the bar from the lug holes. Repeat on the opposite side. Install the new strap by aligning its holes with the bar and pressing until audible locking click occurs. Never force; fluid motion is required.

Yes, the 840.10.021.10 is fully compatible with third-party straps featuring 20mm lug width. Milan-based artisan straps guarantee construction quality equivalent to original equipment, utilising selected materials—alligator leather, calf skin, vulcanised rubber—with meticulous finishing. Custom straps with deployante clasps and leather passages are available with standard turnaround.

A quality leather strap under moderate daily wear exhibits typical durability of 3–5 years. Longevity depends on tanning methodology (vegetable > chromatic), humidity and perspiration exposure, and routine care. Shell Cordovan and alligator straps, being vegetable-tanned leathers of superior density, exceed 7–10 years of service life. Vulcanised rubber and NATO textiles demonstrate longer wear cycles, surpassing 10+ years. Periodic replacement is advisable for hygiene and aesthetic maintenance.