Sapphire, 4.0mm, with anti-reflective coating crystal
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The watch
About this watch
Built around an ultra black dial, the Ocean Crawler Core Diver 2024 - Ultra Black pairs a 44mm case with a Swiss automatic Sellita SW200-1 movement. Highlights include 600m water resistance and a sapphire crystal. It belongs to Hour IV, Dive, in our Expedition season: a natural choice for swimming, sailing and beach travel.
Design
The Ultra Black dial sets the tone, framed by a sapphire unidirectional rotating bezel and set into a 44mm case in 316L stainless steel. At 44mm across, 15.6mm thick and 50mm lug-to-lug, it wears with real presence on the wrist.
Movement
Inside beats a Swiss-made Sellita SW200-1 automatic, running at 28,800 vph with roughly a 40-hour power reserve. It winds itself from the motion of your wrist — no battery, just a mechanical heart that has been individually regulated for accuracy.
In the water
Every Ocean Crawler is pressure-tested in water, and this one is rated to 600 metres (60 ATM). That is genuine capability for recreational and technical scuba diving, freediving and spearfishing. A helium escape valve lets it handle saturation diving and decompression chambers. The unidirectional bezel and bright Super-LumiNova keep elapsed-time tracking clear even in dark water.
Who it’s for
It is made for divers and enthusiasts who want a serious tool watch with genuine depth rating, Swiss-grade mechanics and a design that still turns heads above the surface.
New, boxed and warrantied — free US shipping.
Good to know
Questions & answers
What movement powers the Ocean Crawler Core Diver 2024 - Ultra Black?
A Swiss-made Sellita SW200-1 automatic running at 28,800 vibrations per hour with about a 40-hour power reserve. It is self-winding, so there is no battery to replace.
Can I swim with the Ocean Crawler Core Diver 2024 - Ultra Black?
It is rated to 600 metres (60 ATM) and pressure-tested, so it is suitable for recreational and technical scuba diving, freediving and spearfishing. Have the gaskets checked periodically to keep that rating.
Will the Ocean Crawler Core Diver 2024 - Ultra Black fit my wrist?
The case measures 44mm (15.6mm thick, 22mm lug width) — a bold size that suits larger wrists (roughly 17.5 cm / 6.9 in and up). Our watch size guide (/pages/watch-size-guide) explains how to measure your wrist.
What does the dial of the Ocean Crawler Core Diver 2024 - Ultra Black look like?
It has a ultra black dial, framed by a sapphire unidirectional rotating bezel, under an anti-reflective sapphire crystal.
What makes the Core Diver stand out as a dive watch?
It pairs 600 metres (60 ATM) of tested water resistance with a full sapphire bezel and sapphire crystal, a serious tool-watch build and Swiss Super-LumiNova, so it performs underwater and still looks refined on land.
How good is the Ocean Crawler Core Diver 2024 - Ultra Black's lume and bezel?
The bezel and key dial markers carry Swiss Super-LumiNova, so elapsed-time tracking and reading the time stay clear in dark or murky water.
Are there other versions of the Ocean Crawler Core Diver 2024?
Yes. Other versions we carry include the Ocean Crawler Core Diver 2024 - Blue & Red. Availability changes with stock, so the collection page always shows what is in stock today.
Who is the Ocean Crawler Core Diver 2024 - Ultra Black for?
On the ChronoSeasons dial it sits at Hour IV — Dive, part of the Expedition season, and suits swimming, sailing, beach travel and everyday wear.
How is this watch shipped, and can I return it?
Free tracked & insured international shipping · DHL/FedEx 2–6 days
. Orders ship by tracked courier worldwide and are processed within 1–3 business days. Unworn watches can be returned within 30 days of delivery — see our Shipping and Returns policies.
Took this up to the Boundary Waters for a four-day canoe and camping trip. The C3 lume on the sapphire bezel stayed readable in the tent and the 316L case shrugged off portage knocks. Only note is the crown threads are tight at first and take a firm push to catch.
N. Clark·Edina, MN, US·
CSReply from ChronoSeasons
Hi N., a Boundary Waters canoe trip is a proper test for the Core Diver! Those heavy dive gaskets keep the crown snug at first, and it'll stay watertight for years.
★★★★★★★★★★Verified purchase
No Nonsense Water Watch
Wore this bass fishing on Chickamauga Lake and swimming with my grandkids all weekend. The 600m rating, helium escape valve, and included rubber strap make it practically indestructible around water, and the white hands pop against the Ultra Black face.
Samuel Gutierrez·Chattanooga, TN, US·
★★★★★★★★★★Verified purchase
sharp monochrome diver
Wanted a clean black-dial automatic that works with both scrubs at the hospital and a charcoal suit at medical conferences. The Ultra Black on shark-mesh looks great on my wrist. The bezel action was a little stiff out of the box before working it around a few times.
Troy N.·Baltimore, MD, US·
CSReply from ChronoSeasons
Hi Troy, glad the Ultra Black is pulling double duty at the hospital and conferences! Those 120-click bezel seals definitely loosen up nicely after a few rotations.
★★★★★★★★★★Verified purchase
Reads like a night flight gauge
I fly Beechcraft Barons on weekends and love high-contrast black instrument dials. This Ultra Black Core Diver has zero reflection under the 4mm AR sapphire crystal, and the C3 Super-LumiNova glows bright green in the cabin at dusk.
Seth V.·Wilmington, NC, US·
CSReply from ChronoSeasons
Hi Seth, high-contrast cockpit legibility is exactly what the Ultra Black is all about! Blue skies and safe flying out of Wilmington.
★★★★★★★★★★Verified purchase
Took the Ultra Black up to Lake Tahoe for a weekend of boating and cold-water swimming. The matte black dial and C3 lume are super legible in bright glare and underwater, and the screw-down crown seals tight. The clasp could use an extra micro-adjustment hole for hot afternoons.
H. Green·Reno, NV, US·
CSReply from ChronoSeasons
Hi H., Lake Tahoe is a great testing ground for the Ultra Black! Appreciate the feedback on the clasp micro-adjustment as well.
