Strap for SUB 300 Sharkhunter / Bracelet

The Doxa SUB 300 ref. 821.10.101.10 features a lug width of 20 mm. This measurement is taken as the external distance between the two suspension pins of the case. It is essential to verify this specification when purchasing an aftermarket strap to ensure complete compatibility and eliminate unwanted play.

For the SUB 300, we recommend three options. For daily wear and recreational diving: quality vegetable-tanned leather (shell cordovan, calf, agricultural leather) in brown or black tones. For salt-water marine environments or humid climates: vulcanised rubber that resists salt water and maintains elasticity over time. For versatility: NATO webbing strap, the historic choice of professional divers.

The operation requires a specific spring bar removal tool. Position the watch with the lug facing upwards, insert the tool into the small lateral hole of the pin, apply gentle pressure to retract the pin, and extract it completely. Repeat for the second pin. Align the new strap holes with the lugs and reinsert the pins in sequence. Avoid damage to the lug holes with abrupt movements.

Yes, provided the lug width is exactly 20 mm. Artisanal straps manufactured specifically for this width guarantee correct ergonomics and coherent aesthetics. Always verify that the manufacturer certifies compatibility and that materials (vegetable-tanned leather, rubber, NATO webbing) meet quality standards appropriate for an instrument of this calibre.

Durability depends on material and usage intensity. A shell cordovan with vegetable tanning, if properly maintained (dried regularly after water contact), lasts 3–5 years of intensive daily use. A vegetable-tanned calf resists 2–3 years. Critical factors are: direct sun exposure, prolonged humidity, frequent salt-water contact. In a salt-water marine environment, rubber remains the most durable choice, with service life exceeding 5 years.