Strap for SUB 300 Sharkhunter

The lug width of the Doxa SUB 300 821.10.101.20 is 20 mm. This dimension is standardised for the model and has been engineered to maintain correct proportions on a 42.50 mm case diameter. Always measure the linear distance between the two lug pins on your watch before ordering a strap for compatibility confirmation.

Selection depends on intended use: alligator or vegetable-tanned calf for formal occasions and recreational diving; robust polyamide NATO for versatility and quick-change capability; FKM (Viton) rubber for frequent diving and saltwater resistance. All three materials are compatible with the 20 mm lug width.

Position the watch on a soft pad. Locate the lug pins on both sides. Use a spring bar tool to gently push the pin towards the case centre, creating clearance to extract the old strap. Insert the new strap into the spring mechanism, then allow the pin to snap into place. Verify both pins are correctly seated before wearing.

Yes, provided they feature a 20 mm lug width. However, some historical manufacturers produced variants with 19 mm lugs for alternate Doxa models. Always verify technical specifications before purchasing an aftermarket strap. Artisanal-quality straps, such as those offered by MilanoStraps, are engineered and tested to guarantee perfect compatibility.

A vegetable-tanned leather strap, with regular maintenance (damp cloth cleaning, air drying, occasional conditioning with dedicated balms), lasts 3–5 years with daily wear. Frequent saltwater exposure significantly reduces this duration. On a dive watch, it is advisable to own two straps: one leather for formal occasions and one NATO or rubber for diving.