Strap for SUB 300 Carbon Whitepearl

The lug width (ansa measurement) of the Doxa SUB 300 822.70.011.23 is precisely 20mm. This dimension is specific to technical and diving straps. To verify compatibility with any strap, measure the internal space between the two spring bar holes (lugs) using a digital calliper: it must measure exactly 20mm. Do not measure the outer edge of the lug, as this would include the thickness of the spring bars themselves.

For the SUB 300 822.70.011.23, we recommend three primary solutions: vulcanised rubber for maximum functional authenticity and salt-water resistance, NATO in high-tenacity nylon (black, navy blue, or military green) to maintain the technical language, or leather in alligator or vegetable-tanned calf for more elegant pairings. Structured rubber is ideal for diving and harsh environments; NATO offers daily versatility; leather suits formal occasions whilst maintaining coherence with the watch's technical identity.

Changing the strap on the SUB 300 822.70.011.23 follows the standard procedure: position the watch on a soft surface (microfibre cloth). Locate the spring bars (small metal pins) that secure the strap to the lugs. Use a spring bar tool to compress the internal spring of the pin. Remove the old pin and discard the used strap. Insert the new 20mm strap ensuring the holes align with the case lugs. Reinsert the spring bar using the tool until it clicks into place. Verify the strap is secure by pulling gently in multiple directions.

Yes, any strap with a 20mm lug width is compatible with the Doxa SUB 300 822.70.011.23. Milanostraps offers an extensive selection of artisanal straps in leather (alligator, calf, shell cordovan), NATO, and rubber, all available in 20mm lug width. Always verify that the internal lug width is exactly 20mm before purchase to avoid incompatibility. Premium aftermarket straps often improve comfort and durability compared to standard factory straps.

The longevity of a leather strap depends on material quality, usage intensity, and maintenance. A vegetable-tanned alligator strap, properly cared for, lasts 5–7 years of daily wear, developing an attractive patina over time. Chromium-tanned calf resists 3–5 years of regular use. Shell cordovan, with proper treatment, can last 8–10 years. Leather straps suffer if constantly exposed to salt water: for frequent diving with the SUB 300, choose rubber or NATO. For leather straps, apply natural conditioners every 6–12 months and always dry thoroughly after humidity exposure.