Doxa
SUB 300 840.10.101.10— lug 20mm

The lug width of the Doxa SUB 300 840.10.101.10 is 20 mm. This specific dimension reflects the original Doxa design from the 1960s and requires bespoke compatible straps. You can verify the measurement using a digital calliper, positioned perpendicularly between the two lug pins, excluding any case protrusion.

For intensive diving use, we recommend FKM (Viton) rubber or technical fabric NATO: they resist moisture, salt, and UV rays without absorbing marine odours. For hybrid use (water and urban context), vegetable-tanned alligator or calf leather develop natural patina over time and offer tactile elegance. The choice depends on intended use and personal aesthetic preferences.

Remove the strap using a spring bar tool or dedicated tool: insert the tip into the lateral slot of the lug and lift gently until the pin is released. Extract the pin, then slide the old strap off both lugs. Insert the new strap along both pins, verifying correct positioning before closing with the original spring bar or a deployante buckle.

Yes, provided the lug width is exactly 20 mm. Bespoke straps constructed to this specification ensure perfect fit, wrist stability, and case protection. Avoid adaptations using reducers or spacers, which compromise aesthetics and structural functionality.

A vegetable-tanned leather strap (alligator or calf) typically lasts 3–5 years with regular use and proper maintenance: periodic cleaning with a damp cloth, annual conditioning with natural neutral oil. Extended exposure to salt water accelerates ageing. For frequent diving, alternating with rubber straps extends leather lifespan and preserves natural patina.