The STEELDIVE SD1975C is a modern Tuna-style professional dive watch, engineered for extreme underwater performance.
Built around the proven Seiko NH35 automatic movement, this watch combines a monoblock-inspired steel case, ceramic bezel, sapphire crystal, and 300-meter water resistance—delivering serious dive capability with unmistakable wrist presence.
Japan NH35 automatic movement (hacking & hand-winding)
300M / 30 Bar water resistance – true dive-ready construction
Ceramic unidirectional bezel with super-luminous markers
Synthetic sapphire crystal for scratch resistance
316L stainless steel case with Tuna-style shroud design
Screw-down crown for enhanced water protection
Multiple strap options: steel bracelet or rubber dive strap
Brand: STEELDIVE
Model: SD1975C
Movement: Japan NH35 Automatic
Frequency: 21,600 bph (3Hz)
Power Reserve: Approx. 41 hours
Jewels: 24
Case Material: 316L Stainless Steel
Case Diameter: 47.5 mm
Case Length: 44.0 mm
Case Thickness: 15.0 mm
Lug Width: 22 mm
Crystal: Synthetic Sapphire
Bezel: Ceramic, unidirectional
Crown: Screw-down
Water Resistance: 300 meters / 30 Bar
Lume: C3 / BGW9 / Orange Super Luminous
Weight:
• ~121g (rubber strap)
• ~200g (steel bracelet)
Yes. With 300 meters of water resistance, a screw-down crown, and a ceramic unidirectional bezel, the SD1975C is built for professional-level diving and saturation conditions.
It uses the Japan Seiko NH35 automatic movement, known for reliability, easy servicing, hacking seconds, and manual winding.
The SD1975C features a synthetic sapphire crystal, offering superior scratch resistance compared to mineral glass.
“Tuna Can” refers to a shrouded dive watch design originally developed for extreme depths. It improves shock resistance, crown protection, and overall durability.
Yes. The ceramic bezel is unidirectional, a critical safety feature for dive timing.
Yes. The watch supports 22mm straps, and is available with steel bracelet or rubber dive strap options.
Looking for more extreme divers? → Explore our full [Automatic Dive Watches Collection]
Prefer slimmer dive watches? → Browse [40–42mm Watches]
Interested in Seiko-powered builds? → See all [NH35 Automatic Watches]




We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.
Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.
We are not responsible for any custom fees once the items have been shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.
| Location | *Estimated Shipping Time |
|---|---|
| United States | 5-20 Business days |
| Canada, Europe | 5-20 Business days |
| Australia, New Zealand | 5-20 Business days |
| Central & South America | 5-25 Business days |
| Asia | 5-20 Business days |
| Africa | 5-25 Business days |
Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.
For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.
For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.
If you have any other questions, please contact us and we will do our best to help you out.
All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.
Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:
We do not issue the refund if:
*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page
If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.
If for any reason you would like to exchange your product, perhaps for a different size in clothing, you must contact us first and we will guide you through the steps.
Please do not send your purchase back to us unless we authorise you to do so.
All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.
Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:
We do not issue the refund if:
*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page
If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.
If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.
Please do not send your purchase back to us unless we authorise you to do so.
Great value for the money. Really nicely made automatic watch. Feels extremely solid. Nice weight. Very happy
Excellent watch for the price
Aweso.e lume and wrist presence
Watch is working fine so far, has some weight to the watch and we'll made. Lum is nice and bright.
Steve has become my favorite watch brand! I have about 40 watches., 5 hamilton watches and a marathon, 2 laco watches and the steeldive are my favorites!
This is a great looking watch at a really good price when you can get it on sale and use some coupons. It feels very well made with excellent lume. My only complaint would be where the bracelet attaches to the watch. The pins are too small for the size holes drilled in the bracelet. This does cause unnecessary play. I pulled the pins out and wrapped them in tape which did reduce it. It would be nice if the manufacturer would address it.
The watch is solidly built and accurate. It’s a beautiful timepiece. Steeldive delivers excellent value.
This watch is perfect. Looks beautiful. Great lume. Sapphire dome crystal. I love the bracelet and it’s very comfortable. The shipping was prompt as well.
Such a great value for the money. Nice styling. Very comfortable. All around a+.
I love this orange tuna watch. It looks so cool. Well built, beaufils. It looks masculine and yet refined. My first steeldive watch and i love it. Probably will buy a few more watches.
Love the steeldive tuna sd1975c. Great finishing and looks good on my 8” wrist. A beast of a time piece! !
Great watch!
Impressive, the first watch I bought from this brand on recommendation and it's really worth every euro.
The watch is big, beefy & awesome!
I always wanted a tuna on an engineer. Tons of adjustment in the strap. Excellent lume. As described.
This is an excellent watch. It's well built. The watch color is terrific, i get complements every time i wear it.
This is ridiculous! Fanf’nfantastic
One of the best watches i own. Sapphire crystal, auto seiko movement, excellent two-tone lume, screw down crown, 300m, smooth 120 click bezel with zero back play. This watch is weighty. Solid. Good looking. Masculine. Large. The bracelet is excellent, secure feeling.
The watch looks great., just as in the pictures on the website. I'm very pleased with the purchase