NMK920 Tuna SKX007/SRPD Watch Case Bundle: Gold Finish


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: 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: 44mm
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

Customer Reviews

Based on 18 reviews
Dan V. (Portland, US)
First (and not last) custom build: Orange 5KX Tuna

I’ve always hired other modders to make my custom Seiko builds, but I decided I’d try my own. Namoki made this SKX/SRPD tuna case kit, which was truly “plug and play”. I transformed my beaten up SRPD59 and dropped the dial, movement, handset, and chapter ring into the case. Everything fit perfectly. The Namoki double dome sapphire was perfect was a perfect fit too. The included caseback and crystal gaskets were a nice touch. An overall easy and fun experience. I’ll be back to make myself a custom SRPD Emperor Tuna.

Kirk S. (Edmonton, CA)
Tuna case build, redux

Dial and hands update. Still an amazing case, thanks Namoki!

Kirk S. (Edmonton, CA)
Wicked Tuna!

Namoki has produced a fine tuna case with the usual excellent fit and finish. I really enjoyed this build. Thanks Again!

Jacques E. (Saint-Jerome, CA)

well built

pisarska j. (Balbala, DJ)
Awesome case

emperor tuna is a difficult watch to wear because of its dimensions. This case makes the experience totally different as the case has a skx007 proportion with a small shroud. no regret buying it!