Doxa
SUB 300 821.10.021.10— lug 20mm

The lug width of the Doxa SUB 300 821.10.021.10 is 20 millimetres. This measurement is determined by the case geometry and must be measured perpendicularly between the lug holes to ensure proper compatibility with an aftermarket strap.

Selection depends on intended use and personal preference. For lasting elegance, an alligator strap with vegetable tanning in dark brown or deep burgundy creates sophisticated contrast with the yellow dial. For pure functionality, a vulcanised rubber strap remains the most coherent choice. A medium-grain calf leather in olive green or black with a deployante clasp offers an balanced compromise between aesthetics and practicality.

Changing the strap requires a spring bar remover tool or a sharp toothpick. Position the tool in the lateral groove of the lug hole, apply gentle pressure to release the spring bar, extract the bar and old strap. Insert the new strap, reinsert the spring bar into the lug socket until you hear a click. Verify that the strap is firmly secured on both sides.

Yes, any strap designed for a 20-millimetre lug width is compatible with the SUB 300. Verify the declared width from the manufacturer before purchase. On milanostraps.it you will find a curated selection of alligator, calf, NATO and rubber straps already filtered for 20mm compatibility.

Durability depends on tanning quality, usage pattern and environmental exposure. An alligator strap with vegetable tanning offers 5–8 years of daily wear before conditioning is required. Fine-grain calf has a slightly shorter lifespan (3–5 years). Exposure to salt moisture, intense sun and perspiration accelerates wear. Regularly applying leather balm extends longevity significantly.