NMK920 Tuna SKX007/SRPD Watch Case Bundle: Black and Gold Finish


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Get 20% off any bezel with the purchase of a watch case! Use discount code BEZELBUNDLE during checkout.

Aptly named for its resemblance to a can of tuna, the NMK920 Tuna SKX007/SRPD Watch Case Bundle: Black and Gold Finish is our take on one of the most original and iconic (some would say extreme) dive watch designs released by Seiko. Now you can cook up your own Tuna in any style you like.

Not just a pretty face, the Tuna was (and still is!) an engineering marvel designed to solve issues professional divers faced at extreme depths, producing many industry firsts - it's iconic shroud, vented straps and L-gaskets just being a few. If you want to learn more about about the history, design and legacy of the Tuna, we did an excellent Dive Deep article that you can find here.

Case Specifications:
Diameter: 47mm (including shroud)
Lug to Lug: 46.5mm
Thickness: 11.3mm (without caseback)
Lug Width: 22mm

- Case Bundle includes Bezel and Crown
- 316L Surgical Grade Stainless Steel Construction
- Fits all original and aftermarket SKX007/SRPD mod parts (except bracelet)
- Water Resistance as OEM

Each case comes in a set inclusive of:
- 2 x 22mm Spring Bars
- 1 x Bezel Click Spring
- 1 x Crystal Gasket
- 1 x Caseback Gasket

Free International Delivery
  • Your order of S$50 (or equivalent in your local currency) or more gets free standard shipping, and orders above S$200 is eligible for free express shipping! Shipping costs will be automatically deducted at checkout.

Customer Reviews

Based on 28 reviews
Ken (Natick, US)

Spot on!

Glenn T. (Christchurch, GB)
Seiko stealth ‘tuna’ case

What a fantastic case, big and tooly but very wearable!

The finish and construction is fantastic, bezel action is great too, very Seiko like.

My only criticism is the space between the lugs is limited and fitting thicker rubber straps was difficult, only recommendation would be to extend the lugs slightly or remove some steel from the case to create a touch more room.

barak (Kfar Saba, IL)
Blue PVD tuna case

Extremely interesting case, great look!

Brandon J.
Amazing case

Such a gorgeous Tuna conversion case. Will purchase more for future builds. Still waiting on my "Nemo" bezel insert from ebay. That would be a cool offering. Love me some orange and blue.

Casey B. (Weatherford, US)

Fantastic quality!