Strap for SUB 300 Aquamarine / Bracelet

The lug width of the Doxa SUB 300 821.10.241.10 is 20 mm. This measurement represents the space between the two lugs where the strap is inserted. It is essential to verify this dimension before ordering a strap, as even minor measurement errors would make the accessory incompatible with your watch.

The Doxa SUB 300 821.10.241.10 pairs beautifully with vegetable-tanned alligator leather straps, which develop natural patina over time. For actual diving use, a robust fabric NATO or vulcanised rubber strap ensures excellent water resistance and quick drying. Shell cordovan straps offer luxury and durability, ideal for formal contexts. Choose based on your primary use case.

Strap replacement is performed using the spring bars: small metal levers that protrude from the case. Position the watch on a soft surface, then use a spring bar tool to gently compress the lug and slide the strap outward. Perform this operation on both sides, then slide the new strap through the case attachments until the spring bars click into place. Avoid forcing to prevent damage to the lugs.

Absolutely yes. Any strap with a 20 mm lug width is compatible with the SUB 300 821.10.241.10, provided it is manufactured to adequate construction standards. Artisanal high-quality straps often exceed original equipment straps in materials and finishing. Always verify the lug width before ordering and ensure that the shoulder pieces fit perfectly against the case.

A high-quality artisanal leather strap lasts an average of 3 to 5 years with daily wear. This period extends to 5-7 years if the strap is worn occasionally. Longevity depends on the tanning method used: vegetable-tanned leather ages better than synthetic tannins, developing patina and character over time. Regular maintenance—cleaning with a damp cloth and occasional conditioning—significantly extends the strap's life.