300m+ (pro dive) watches

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Serious dive watches with screw-down crowns and beefy gaskets. We list 16 watches rated 300m. 15 are automatic and 1 runs on a battery or light. All 16 have a sapphire crystal. Cases run from 40mm to 44mm.

What 300m+ water resistance actually means

30 bar static, the professional end. Typically paired with a screw-down crown and thicker gaskets, and usually — though not always — certified to ISO 6425 rather than only ISO 22810. Worth checking the dial: the word DIVER'S is a regulated marking, whereas “300m water resistant” on its own is only the pressure figure.

Water resistance is not permanent — gaskets compress and age. Manufacturers generally recommend a pressure re-test if the case has been opened, or periodically for a watch used in water.

Last verified 2026-06-27 · 16 models

Watch	Movement	WR	Case	Crystal	Style	Tier	Buy
Steinhart Ocean One	Automatic	300m	42mm	sapphire	Dive	Mid	Check priceCheck price
Tissot Seastar 1000	Automatic	300m	43mm	sapphire	Dive	Upper	Check priceCheck price
Christopher Ward C60 Trident	Automatic	300m	40mm	sapphire	Dive	Upper	Check priceCheck price
Certina DS Action Diver	Automatic	300m	43mm	sapphire	Dive	Upper	Check priceCheck price
Squale 1521	Automatic	300m	42mm	sapphire	Dive	Upper	Check priceCheck price
Marathon TSAR	Quartz	300m	41mm	sapphire	Dive	Upper	Check priceCheck price
Marathon GSAR	Automatic	300m	41mm	sapphire	Dive	Upper	Check priceCheck price
Longines HydroConquest	Automatic	300m	41mm	sapphire	Dive	Premium	See price on AmazonCheck price
Oris Aquis Date	Automatic	300m	41.5mm	sapphire	Dive	Premium	See price on AmazonCheck price
Monta Oceanking	Automatic	300m	41mm	sapphire	Dive	Premium	Check priceCheck price
Tudor Pelagos	Automatic	300m	42mm	sapphire	Dive	Premium	Check priceCheck price
Sinn U1	Automatic	300m	44mm	sapphire	Dive	Premium	Check priceCheck price
Omega Seamaster Diver 300M	Automatic	300m	42mm	sapphire	Dive	Premium	Check priceCheck price
Rolex Submariner	Automatic	300m	41mm	sapphire	Dive	Premium	Check priceCheck price
Tag Heuer Aquaracer Professional 300	Automatic	300m	43mm	sapphire	Dive	Premium	Check priceCheck price
Doxa Sub 300	Automatic	300m	42.5mm	sapphire	Dive	Premium	Check priceCheck price

Quick answers

Which watches rated 300m have a sapphire crystal?

All 16 of them. Sapphire resists scratches better than mineral or acrylic. How the crystals compare.

Are there automatic or hand-wound watches rated 300m?

Yes, 15 of the 16 are automatic: Steinhart Ocean One, Tissot Seastar 1000, Christopher Ward C60 Trident, Certina DS Action Diver, Squale 1521, Marathon GSAR, Longines HydroConquest, Oris Aquis Date and 7 more in the table. Automatic vs quartz.

What is the smallest of the watches rated 300m?

The smallest is the Christopher Ward C60 Trident, at 40mm. The largest is the Sinn U1, at 44mm. What size fits your wrist.

Head-to-head comparisons

see dive watches · other water resistance: 30m · 50m · 100m · 200m