Strap for SUB 300T Caribbean / Bracelet

The lug width of the Doxa SUB 300 840.10.201.10 is 20 mm. This specification is critical when selecting aftermarket straps: all straps must measure exactly 20 mm lug width to ensure compatibility with the original case lugs. You can verify this measurement using a digital calliper, measuring the internal space between the two lateral lugs.

There is no single 'best' strap in absolute terms; the choice depends on your intended use. For daily elegance, we recommend an alligator strap with vegetable tanning in brown or black; for tactical versatility and practicality, a nylon NATO strap; for professional diving, a black FKM rubber that resists saltwater and does not degrade. An English calf leather strap with vegetable tanning represents the ideal compromise between artisanal aesthetics and recreational diving functionality.

Changing the strap on the SUB 300 840.10.201.10 requires a spring bar tool or a small flathead screwdriver. Remove the watch from your wrist, position the case face-up, insert the tool tip under the spring bar pin of the first lug, apply light lateral pressure to release the pin, and slide the strap out. Repeat for the opposite lug. Installation of the new strap follows the reverse procedure: align the strap holes with the lugs, insert the elastic pin until you hear a click. Verify the strap is secure before wearing the watch.

Yes, provided the lug width is certified at 20 mm. MilanoStraps supplies a curated selection of artisanal straps fully compatible with the SUB 300 840.10.201.10, in premium materials including African alligator with vegetable tanning, English calf leather, nylon NATO, and FKM rubber. All straps are inspected for dimensional conformity and crafted to last, with finishing that respects the original watch's aesthetics.

The lifespan of a leather strap depends on use and maintenance. A high-quality alligator or calf leather strap with vegetable tanning typically lasts 2–3 years of daily wear on a SUB 300. Regular water exposure, perspiration, and wrist humidity accelerate fibre ageing; vegetable tanning, whilst natural, absorbs moisture and requires periodic conditioning with vegetable oils. If you wear the watch during frequent recreational diving, we recommend alternating the leather strap with an FKM rubber to extend the life of the leather and keep the SUB 300 always functional in water.