Doxa
SUB 300 840.10.101.20— lug 20mm
Doxa SUB 300 840.10.101.20: 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 840.10.101.20The essential strap measurement.
Browse 20mm straps →840.10.101.20
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 300 840.10.101.20?
The Doxa SUB 300 840.10.101.20 features a lug width of 20 millimetres. This measurement, taken from the inner shoulder to the opposite inner shoulder, is the standard specification across the entire SUB 300 family and has been engineered to maintain optimal proportions between case and wrist. Any compatible strap must strictly respect this dimension to ensure proper fit without play.
What is the best strap for the Doxa SUB 300?
The choice depends on intended usage. For daily elegance, we recommend a vegetable-tanned calf leather strap that develops golden patina over time, creating striking contrast with the orange dial. For frequent diving, FKM (Viton) rubber offers complete resistance to saltwater and chlorine. Alligator leather in dark brown maintains inherent lustre, whilst NATO straps in Cordura nylon provide practicality and robustness in genuine marine environments.
How do I change the strap on my Doxa SUB 300 840.10.101.20?
To change the strap, you will need a specialist tool called a spring bar tool. Position the bifurcated end of the tool against the pin securing the strap to the case, apply gentle downward pressure to compress the internal spring, and pull the strap outward. Repeat on the opposite side. Insert the new strap by aligning the lugs with the case shoulders and re-insert the pins. Verify that the strap is securely fastened before wearing the watch.
Can I use an aftermarket strap on my Doxa SUB 300?
Yes, absolutely. It is essential that the aftermarket strap is manufactured for exactly 20-millimetre lug width. Many superior quality straps such as alligator, shell cordovan or vegetable-tanned leather are produced exclusively by specialist craftsmen specifically for this lug specification. Always verify that the manufacturer specifies 20 mm; using lugs of different widths compromises both aesthetics and wearing security.
How long does a leather strap last on a Doxa SUB 300?
Longevity depends on the tanning method and environment of use. A vegetable-tanned strap typically lasts 18–24 months if exposed to frequent marine humidity; in dry environments, it easily reaches 3–4 years. Alligator and shell cordovan are more resistant to moisture and achieve 2–3 years even with regular diving. If your SUB 300 is used primarily in swimming pools or the sea, we recommend alternating leather straps with nylon NATO or Viton rubber to extend the lifespan of the leather accessory.