Doxa
SUB 300 821.10.021.20— lug 20mm
Doxa SUB 300 821.10.021.20: 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 821.10.021.20The essential strap measurement.
Browse 20mm straps →821.10.021.20
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 300 821.10.021.20?
The lug width of the Doxa SUB 300 821.10.021.20 is precisely 20 mm. This specification is crucial for selecting an aftermarket strap: an undersized strap will not secure correctly in the lug attachments, whilst an oversized one will cause unwanted movement. We recommend measuring the internal distance between the lugs with a digital calliper to confirm compatibility prior to purchase.
Which strap is best suited to the Doxa SUB 300 821.10.021.20?
The choice depends on usage context. For professional and formal applications, a dark brown or black alligator strap enhances the elegance of the stainless steel case and amplifies contrast with the orange dial. For sporting and diving use, a black or navy blue vulcanised rubber strap maintains functionality in humid and saline environments. For tactical versatility, a military-pattern NATO fabric strap complements the technical heritage of the model. In all cases, the strap should remain visually subordinate to the orange dial, which functions as the primary visual centre.
How do I change the strap on the Doxa SUB 300 821.10.021.20?
The SUB 300 strap is changed using a spring bar tool or dedicated strap remover. Position the watch case upwards, locate the spring bar pins securing the strap to the case, and use the tool to compress the pin whilst extracting it outwards. Once the pin is removed, the old strap detaches easily. Insert the new strap by passing the spring bar through the dedicated holes in the case and lug attachments, pushing until it clicks into place. Never force the pin: gradual, controlled pressure is key.
Is an aftermarket strap compatible with the Doxa SUB 300 821.10.021.20?
Yes, any strap with an exact 20 mm lug width is compatible with the 821.10.021.20. Artisanal straps from Milano Straps, crafted in leather, alligator, vegetable tanning, NATO and rubber, are available in 20 mm sizing and guarantee full compatibility with the SUB 300 case. Always verify that your strap is labelled as 20 mm before purchase to avoid incompatibility.
How long does a leather strap last on the Doxa SUB 300 821.10.021.20?
Leather strap durability depends on frequency of wear, environmental conditions and tanning method. An alligator or vegetable-tanned strap, worn daily under normal conditions, maintains structural functionality for 3–5 years. Exposure to moisture, salt perspiration and UV rays accelerates wear and ageing. A vulcanised rubber or NATO fabric strap, being more robust, may last 5–7 years. Natural leather patina is a valued feature: the strap does not "wear out", but transforms visually, developing character and personality over time.