The DOXA SUB 300 Professional with rubber strap is the 821.10.351.10 configuration: a 42.5 mm stainless-steel dive watch supplied on an FKM rubber strap with a folding clasp and ratcheting wetsuit extension. DOXA lists a 300 m water-resistance rating and a COSC-certified automatic movement with a 38-hour power reserve. The specifications below describe the official listing; check the regional product page for current price and availability.
Which watch is the rubber-strap version?
DOXA identifies this configuration as the SUB 300 Professional, SKU 821.10.351.10. It is distinct from the separately named SUB 300β and SUB 300T. If comparing listings or ordering a strap, confirm both the model name and reference so you do not mistake another SUB 300-family watch for this one.
DOXA’s US product listing and European product listing present the SUB 300 Professional in a rubber-strap configuration as well as a stainless-steel Beads of Rice bracelet configuration.
Case, dimensions, and water resistance
According to DOXA’s US specifications, the case is stainless steel, measuring 42.5 mm in diameter, 45 mm in length, and 13.4 mm in height. The brand describes it as 316L stainless steel. The case has a screw-down crown and screw-down caseback, with a sapphire crystal.
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- NH35A Movement: This tactical frog watch V2 Orange is powered by the 24 Jewels NH35A self-winding movement, Assembled in Japan. Delicate and accurate.Power reserve can last for 41 hours.
- Cool Automatic Watch: Scratch resistant sapphire crystal glass with anti-reflective coating on inner surface; Stainless steel bracelet is adjustable by removing or adding links and fold over clasp with safety. A must have tactical frog watch for collection.
- Diving Watches: Double layer bezel design. Screw down lock for water tight seal and uni-directional outer stainless steel bezel to tell you "under" time easilly. Tactical frog mechanical watch is water resistant to 200M(20ATM). Suitable for professional marine activities, swimming, water sports and daily wearing.
- Luminated Watch: Green Luminious hands, scales and hour markers are featuring Swiss C3 material, which can last for at least 5 hours in dark and is able to quickly absorb and store light energy in a bright environment.
- Fashionable Style: The stylish outlook and vivid colored dial enhanced the sport and dynamic feel. A fashionable watch present for men, a must have for watch collection.
The published water-resistance rating is 30 ATM, or 300 m / 984 ft. This is the manufacturer’s stated rating; it is not a claim that the watch is suitable for every kind of underwater activity or operating condition. Follow DOXA’s care guidance and ensure the crown is secured before exposure to water.
Movement and display
The watch uses a Swiss self-winding mechanical movement that DOXA identifies as a COSC-certified chronometer. The published specifications give it a 38-hour power reserve and a frequency of 28,800 vibrations per hour (4.0 Hz). The display includes hours, minutes, seconds, and a date.
Rank #2
- Complete Strap: This 20mm black watch band includes preinstalled quick release spring bars, providing a convenient replacement for worn, damaged or outdated wristwatch straps.
- PU Leather: Made from selected PU leather with a soft lining, this matte watch strap offers a smooth feel, vintage appearance and comfortable fit for everyday wear.
- Quick Release: Built-in quick release pins allow fast installation and removal without additional tools, while the 20mm lug width provides a precise connection.
- Adjustable Fit: The 7.1in/18cm replacement band features multiple adjustment holes and a polished stainless steel buckle for a secure, personalized wrist fit.
- Customer Support: Please measure the inner distance between your watch lugs before ordering; contact us if you have questions about size, installation or product quality.
What the rubber strap includes
The supplied strap is FKM rubber, sized for a 20 mm lug width. DOXA specifies a folding clasp with a ratcheting wetsuit extension, which allows the clasp to extend for wear over diving equipment. The bracelet configuration uses a stainless-steel Beads of Rice bracelet and also has a wetsuit extension, according to the product listing.
For a replacement or alternate-color strap, verify compatibility with the exact SUB 300 reference and clasp arrangement before ordering. DOXA lists SUB 300 rubber straps separately, but a shared family name alone is not enough to establish fit for every related model.
Rank #3
- NH35A Movement: The tactical frog watch is powered by the 24 Jewels NH35A self-winding movement, Assembled in Japan. Delicate and accurate.Power reserve can last for 41 hours
- Cool Automatic Watch: Scratch resistant sapphire crystal glass with anti-reflective coating on inner surface; Stainless steel bracelet is adjustable by removing or adding links and fold over clasp with safety. A must have tactical frog watch for collection
- Diving Watches: Double layer bezel design. Screw down lock for water tight seal and uni-directional outer stainless steel bezel to tell you "under" time easilly. Tactical frog mechanical watch is water resistant to 200M(20ATM). Suitable for professional marine activities, swimming, water sports and daily wearing
- Luminated Watch: Green Luminious hands, scales and hour markers are featuring C3 material, which can last for at least 5 hours in dark and is able to quickly absorb and store light energy in a bright environment
- Fashionable Style: The stylish outlook and vivid colored dial enhanced the sport and dynamic feel. A fashionable watch present for men, a must have for watch collection
Official listing and price context
Prices vary by regional listing and may change. When retrieved on October 7, 2026, DOXA’s US page displayed the watch at USD 2,890 and rubber straps at USD 490; its European page displayed the watch at EUR 2,790 and rubber straps at EUR 490. These are listing snapshots, not guaranteed current prices or a direct currency comparison. Confirm local price, stock, delivery, taxes, and warranty terms with DOXA or an authorized retailer before purchase.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Rubber strap or Beads of Rice bracelet?
The main practical distinction is the supplied wrist interface: FKM rubber with a folding clasp on this version, versus stainless-steel Beads of Rice links on the bracelet version. Both configurations are listed with a wetsuit extension. Choose based on the material and wearing context you prefer, and compare the price and exact reference shown by your regional seller.
Quick Recap
Rank #4
- Complete Strap: This 20mm dark brown watch band includes preinstalled quick release spring bars, providing a convenient replacement for worn, damaged or outdated wristwatch straps.
- PU Leather: Selected PU leather with a soft lining creates a comfortable wrist feel, while the matte surface and subtle vintage texture deliver a refined, timeless appearance.
- Quick Release: Built-in quick release pins allow fast installation and removal without additional tools, while the 20mm lug width provides a secure and precise connection.
- Adjustable Fit: The 7.1"/18cm replacement strap features multiple adjustment holes and a polished stainless steel pin buckle for a secure, personalized fit during everyday wear.
- Customer Support: Please measure the inner distance between your watch lugs before ordering; contact us if you have questions about sizing, installation or product quality.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
