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Comparison

DOXA Sub 300 vs Sub 300T: what's the difference, and which to buy? (2026)

They look almost the same, both are 42.5mm, and both come in the same colours, from the orange Professional to the black Sharkhunter. But the Sub 300 and the Sub 300T are different watches underneath, and one costs £700 more. This is what you get for the money, and which one to buy, using DOXA's own specifications.

By the Sterling Guild team · Updated 23 October 2026 · Prices checked daily at Goldsmiths · How we choose

Our top picks: DOXA Sub 300 Professional, DOXA Sub 300T Sharkhunter, DOXA Sub 300T Caribbean

We don't sell watches. Links to retailers are affiliate links: if you buy after following one, the retailer may pay us a commission. You pay the same price, and no brand or retailer pays to appear. How this works

Our top picks

  1. Best DOXA overallDOXA Sub 300 Professional£2,590The Sub 300 Professional, with DOXA's orange dial, a COSC-certified chronometer movement and the beads of rice bracelet.
  2. Best value DOXADOXA Sub 300T Sharkhunter£1,890The Sub 300T Sharkhunter, water resistant to 1,200 metres with a helium release valve, for £700 less.
  3. Best 300T colourDOXA Sub 300T Caribbean£1,890The Sub 300T in Caribbean blue.
  4. Best DOXA for travellersDOXA Sub 250T GMT£2,390The 40mm Sub 250T GMT, with a 50-hour power reserve and a GMT hand.
In this guide
  1. How we chose
  2. Sub 300 vs Sub 300T at a glance
  3. What's the difference?
  4. The best DOXA overall: Sub 300 Professional
  5. The best value DOXA: Sub 300T
  6. Other DOXAs worth knowing
  7. DOXA or something else?
  8. Questions people ask

The short answer: buy the Sub 300 if you can, for its COSC-certified chronometer movement, domed crystal and beads of rice bracelet. Buy the Sub 300T if you'd rather save £700, or if you like the idea of a watch rated to 1,200 metres.

Every watch here is sold new by Goldsmiths, a UK authorised DOXA retailer. Prices are Goldsmiths' own on the date shown, and they matched DOXA's own UK prices when we checked.

How we chose

We read DOXA's own UK product pages for the Sub 300 and Sub 300T, and Goldsmiths' descriptions of every DOXA in stock. Where DOXA doesn't give a figure, we say so rather than guess. We earn a commission if you buy through our links, which never changes the price you pay.

Sub 300 vs Sub 300T at a glance

Sub 300 Sub 300T
Price at Goldsmiths £2,590 £1,890
Case size 42.5mm 42.5mm
Water resistance 300 metres 1,200 metres
Helium release valve No Yes
Movement Swiss automatic, COSC-certified chronometer Swiss automatic
Power reserve 38 hours
Crystal Domed sapphire Sapphire
Bracelet Beads of rice Steel bracelet
Based on The 1967 SUB The 1968 SUB 300T Conquistador

From DOXA's product pages for the Sub 300 Sharkhunter and Sub 300T Sharkhunter, read 23 October 2026. A blank means DOXA's 300T page doesn't give it.

What's the difference?

Water resistance and the helium valve. This is the biggest difference on paper. DOXA rates the Sub 300 at 30 bar (300 metres) and the Sub 300T at 120 bar (1,200 metres), and the 300T has a helium release valve. DOXA says the 1968 SUB 300T Conquistador was the first diver's watch for the general public with one. In practice, both are far more than any swimmer or recreational diver will need.

The movement. DOXA describes the Sub 300's self-winding movement as a COSC-certified chronometer, with a 38-hour power reserve. Its page for the 300T doesn't say it's certified.

The crystal and bracelet. DOXA says the Sub 300's sapphire crystal has the same domed shape as the plexiglass on the 1967 original, and it comes on DOXA's "beads of rice" bracelet with a wetsuit extension. The 300T has a sapphire crystal with an anti-reflective coating, on a steel bracelet with a folding clasp.

The history. The Sub 300 is based on the original 1967 SUB, which DOXA says was the first purpose-designed diver's watch for the general public, and the first with a one-way bezel showing both dive time and depth for no-decompression dives. The Sub 300T is based on the 1968 SUB 300T Conquistador. Both have that bezel.

The best DOXA overall: Sub 300 Professional

The Sub 300 in orange, the colour DOXA made famous. DOXA says the orange dial of the 1967 original greatly improved readability underwater. The case is 42.5mm and 13.4mm high, with a date at 3 o'clock and a 20mm lug width, according to DOXA.

DOXA Sub 300 Professional
Best DOXA overallDOXA Sub 300 Professional 821.10.351.10 · 42mm · Automatic · 300 m water resistant £2,590Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Sub 300 Sharkhunter. The same watch with a black dial, for something less bold.

DOXA Sub 300 Sharkhunter
DOXA Sub 300 Sharkhunter 821.10.101.10 · 42.5mm · Automatic · 300 m water resistant £2,590Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths
DOXA Sub 300 Professional and DOXA Sub 300T Caribbean Discover DOXA 16 watches at Goldsmiths, £1,890 to £6,950. Discover all 16

The best value DOXA: Sub 300T

The Sub 300T gives you the DOXA look, 1,200 metres of water resistance and a helium release valve for £700 less than the Sub 300. DOXA says the current 300T was presented in September 2019, 50 years after the original Conquistador.

DOXA Sub 300T Sharkhunter
Best value DOXADOXA Sub 300T Sharkhunter 840.10.101.10 · 42.5mm · Automatic · 1200 m water resistant £1,890Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Choose your colour. Goldsmiths sells the 300T in Caribbean blue, Aquamarine and Sea Emerald green, all at the same price.

DOXA Sub 300T Caribbean
Best 300T colourDOXA Sub 300T Caribbean 840.10.201.10 · 42.5mm · Automatic · 1200 m water resistant £1,890Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Sub 300T Clive Cussler. A special edition with an aged steel case and beads of rice bracelet. Goldsmiths' description lists a 38-hour power reserve, a date, a flat sapphire crystal and a case 42.5mm by 44.5mm and 14mm high.

DOXA SUB 300T Clive Cussler
DOXA SUB 300T Clive Cussler 840.80.031.15 · 42.5 × 44.5mm · Automatic · 1200 m water resistant £2,690Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Other DOXAs worth knowing

Sub 250T GMT. For travellers: a 40mm DOXA with a GMT hand for a second time zone, water resistant to 250 metres, with a Swiss automatic movement and a 50-hour power reserve, according to Goldsmiths' description.

DOXA Sub 250T GMT
Best DOXA for travellersDOXA Sub 250T GMT 855.10.351.10 · 40mm · Automatic · 250 m water resistant £2,390Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Sub 1500T. The heavy-duty DOXA: a 45mm cushion-shaped case rated to 1,500 metres, with a helium release valve, according to Goldsmiths' description.

DOXA Sub 1500T Professional
DOXA Sub 1500T Professional 883.10.351.10 · 45mm · Automatic · 1500 m water resistant £2,390Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Sub 300 Carbon Seafoam. A limited edition of 100 pieces in a carbon case with a seafoam green dial, exclusive to the Watches of Switzerland Group, according to Goldsmiths' description.

DOXA SUB 300 Carbon
DOXA SUB 300 Carbon 822.70.131.20-SE5 · 42.5mm · Automatic · 300 m water resistant £3,890Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

DOXA or something else?

For a diver from a bigger brand at a similar price, see which TAG Heuer Aquaracer to buy or which Longines HydroConquest to buy. For more, see which Omega Seamaster to buy, and for less, our best dive watches under £1,000.

More DOXA watches

6 more from Goldsmiths, from £2,150 to £6,950. Prices and specifications are Goldsmiths' own; we haven't written about these ones in detail.

Questions people ask

What is the difference between the DOXA Sub 300 and Sub 300T?
The Sub 300 is water resistant to 300 metres, has a COSC-certified chronometer movement with a 38-hour power reserve, a domed sapphire crystal and the 'beads of rice' bracelet, according to DOXA. The Sub 300T is water resistant to 1,200 metres and has a helium release valve for professional saturation divers, and it costs £700 less at Goldsmiths. Both are 42.5mm.
DOXA Sub 300 or 300T: which should I buy?
For most people, the Sub 300: the chronometer movement, the domed crystal and the beads of rice bracelet make it the more special watch, and 300 metres is far more than you'll ever need. If you'd rather spend less, or you like the idea of 1,200 metres and a helium valve, the Sub 300T is the better value.
Is the DOXA Sub 300T a chronometer?
DOXA describes the Sub 300's movement as a COSC-certified chronometer. Its page for the standard Sub 300T, which we read in October 2026, doesn't say the 300T is certified, so we wouldn't assume it is.
What do DOXA's colour names mean?
They name the dial colour. The Professional is orange, the Sharkhunter is black and the Caribbean is blue; Goldsmiths also sells the 300T in Aquamarine (blue) and Sea Emerald (green). DOXA's own range also includes Searambler, Divingstar and Whitepearl.
Why are DOXA dials orange?
DOXA says the orange dial of the original 1967 SUB greatly improved readability underwater. The orange version is called the Professional.
Do I need a helium release valve?
Only if you're a professional saturation diver living in a pressurised chamber. For swimming, snorkelling and recreational diving, it makes no difference.
Is DOXA a good watch brand?
Yes. DOXA is best known for dive watches, and it says its 1967 SUB was the first purpose-designed diver's watch for the general public. Goldsmiths, a UK authorised retailer, sells the current range new.

Related guides

How we write these guides: every watch is one you can buy new from a UK authorised retailer. Prices and specifications come from the retailer's own product page, and anything extra comes from the brand's website. We check prices and stock every morning, but they can change, so the retailer's page always has the final word. No brand or retailer pays to appear. Read how we choose watches and jewellery and our editorial policy; spotted a mistake? Email contact@sterlingguild.co.uk.