Strap for SUB 300 Carbon Divingstar

The lug width of the Doxa SUB 300 822.70.361.20 is 20 millimetres. This dimension represents the distance between the spring bar attachment points and determines which strap is compatible. Always verify the lug width of the original strap before purchasing an aftermarket alternative.

For the SUB 300 titanium-carbon case, we recommend black or dark brown alligator leather for formal contexts, or vegetable-tanned calf if you desire natural ageing patina. If you will use the watch in water frequently, vulcanised rubber or NATO nylon offer greater practicality and moisture resistance. The choice depends on your primary use case: professional, recreational, or mixed.

Remove the strap by extracting the spring bars using a dedicated spring bar tool. Position the tool in the lateral notch of the bar, apply gentle pressure to retract it, then slide the bar out of the strap housing. Repeat on the other side. Insert the new 20mm strap by aligning its holes with the bars, then reinsert the bars until they click into place. Never force the case during this operation.

Yes, any strap with a 20mm lug width is physically compatible. However, aesthetic and functional compatibility depends on construction quality: a poorly made strap could damage the case lugs or detach from the spring bars prematurely. Choose certified craftspeople who manufacture straps with precise tolerances and durable materials.

A quality natural leather strap, rotated with other straps, typically lasts 3–5 years of daily wear. Longevity depends on: frequency of wear, direct sunlight exposure, environmental humidity, and maintenance (periodic cleaning and conditioning with appropriate creams). Vegetable-tanned leather tends to last longer than synthetic alternatives, developing a desirable patina over time.