Doxa
SUB 300 821.10.351.10— lug 20mm
Doxa SUB 300 821.10.351.10: 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 821.10.351.10The essential strap measurement.
Browse 20mm straps →821.10.351.10
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 300 821.10.351.10?
The Doxa SUB 300 821.10.351.10 is equipped with a 20mm lug width, a specific dimension for this model that reflects professional diving watch proportioning standards. Correct measurement is performed with a metal ruler, positioning the reference orthogonal to the lugs and calculating the internal centre-to-centre distance. This precision is mandatory before purchasing any aftermarket strap.
What is the best strap for the Doxa SUB 300 821.10.351.10?
The best strap choice depends on intended use. For technical diving and saltwater environments, FKM (Viton) rubber is supreme: total chemical resistance, zero deterioration, optimal grip with wet diving suit. For daily wear with occasional water exposure, immersion-grade alligator (vegetable tanning) develops a tobacco patina that emphasises the watch's instrumental aesthetic and orange dial. NATO straps in mil-spec polyamide offer versatile aesthetics and zero maintenance. All options are compatible with the 20mm lug width.
How do you change the strap on the Doxa SUB 300 821.10.351.10?
Strap replacement requires a spring bar removal tool to disengage elastic pins from the lug eyelets. Position the watch on a soft surface (microfibre cloth), then insert the flat tip of the tool into the lower opening of the first lug, apply gentle pressure to retract the internal spring and free the pin. Repeat for the opposite lug. The operation takes 3-5 minutes. Those without a dedicated tool should entrust the task to a specialised service centre to avoid scratching the case.
Is an aftermarket strap compatible with the Doxa SUB 300 821.10.351.10?
Yes, any strap with a 20mm lug width is compatible with the 821.10.351.10. However, it is essential to verify the measurement before purchase: 18mm or 22mm straps will not install without damaging the lug eyelets. Specialist strap suppliers offer selections dedicated to this lug width, with options in leather, NATO, and rubber. Always verify technical specifications and compatible pin dimensions (typically 1.5mm diameter).
How long does a leather strap last on the Doxa SUB 300 821.10.351.10?
Leather strap durability depends on material and use environment. Immersion-grade alligator with vegetable tanning guarantees 4-5 years of frequent use in marine environments with proper maintenance (rinsing and drying after immersion, seasonal conditioning with natural oils). Traditional calf leather has similar durability if protected from direct saltwater exposure. Shell cordovan, being denser, reaches 6-7 years. To extend strap life, avoid prolonged saltwater immersion without subsequent freshwater rinsing. FKM rubber straps exceed 8-10 years without appreciable deterioration, making them the technical option for intensive underwater use.