Doxa
SUB 300 821.10.361.31— lug 20mm
Doxa SUB 300 821.10.361.31: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Doxa 821.10.361.31The essential strap measurement.
Browse 20mm straps →821.10.361.31
ETA caliber 2824-2 Hours, Minutes, Seconds | Date
The Heritage
Compatible Straps
Selected for the 20mm lug width of the SUB 300
FAQ
What is the lug width of the Doxa SUB 300 821.10.361.31?
The lug width of the Doxa SUB 300 821.10.361.31 is 20 mm (20.00 mm). This measurement corresponds to the distance between the inner holes of the spring bars. Always verify this specification before purchasing a compatible strap, as precision down to the tenth of a millimetre ensures a secure fit without lateral play and optimal stability during wear.
What is the best strap for the Doxa SUB 300 821.10.361.31?
There is no universal answer; the optimal choice depends on intended use and personal preference. For professional diving operations, an FKM rubber strap offers complete water resistance and chemical durability. For urban daily wear, an alligator strap in black or blue enhances the elegance of reference 821.10.361.31 without compromise. Calf leather with vegetable tanning combines aesthetic authenticity with longevity. For maximum versatility, a fabric NATO strap remains the most practical choice across all contexts.
How do I change the strap on a Doxa SUB 300?
Strap replacement on the SUB 300 is straightforward and requires only a spring bar tool. Carefully compress the spring bars at each end using the tool to remove the old strap. Align the new strap's holes with the 20 mm lug width and release the spring bars until they seat completely in their grooves. Always verify that there is no lateral play; the strap must sit flush against the case.
Is there an aftermarket strap compatible with the Doxa SUB 300 821.10.361.31?
Yes, any artisanal strap with a 20 mm lug width is compatible with the Doxa SUB 300 821.10.361.31. Quality aftermarket straps allow complete personalisation of your watch according to aesthetic and functional preferences. Always confirm that the seller explicitly specifies 20 mm compatibility and that the spring bars are correctly positioned for precise installation.
How long does a leather strap last on the Doxa SUB 300?
Leather strap longevity depends on material type, tanning method, and usage conditions. A high-quality shell cordovan strap with vegetable tanning can withstand 3–5 years of daily wear while developing an appreciated patina. Standard alligator or calf typically lasts 2–3 years. FKM rubber straps offer superior durability (5–7 years), whilst fabric NATO straps are essentially permanent. Prolonged exposure to seawater, chlorine, and UV radiation reduces leather lifespan; rotating straps on a SUB 300 used frequently in marine environments extends overall longevity.