NMK-WK21 DIY Watchmaking Kit: "MB-78" by Watch Me Build It


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namoki x Watch Me Build It

Creator: Shaun of Watch Me Build It

Creator Notes: When I began watchmaking in 2018, I discovered the ‘Lord of the Chapter Rings,’ a legendary watch by the brand with the crown logo. Its younger sibling, the BB58, became famous for resembling an early version of the ultimate dive watch, featuring a large crown without guards.

Namoki asked me to collaborate on a DIY kit to honor this iconic design:
Case: NMK939 with a big crown, slim bezel, and ‘top hat’ sapphire.
Bracelet: Riveted end plates and female links, echoing early dive watches.
Dial and Hands: BB58 dial with gold accents and merc hands, capturing 1950s style.
Bezel Insert: Brushed steel with white indices and a red triangle at 12.

My YouTube channel, ‘Watch Me Build It’ (WMBI), inspired the kit name: The MB-78. Collaborating with Namoki is an honor, and I hope you enjoy this tribute to the iconic dive watch.

Our DIY Watchmaking Kits will have you building your own "MB-78" Vintage Dive Watch in no time. Packed with high quality watch components, this kit will include all the tools and instructions you’ll need to build your own watch. This introductory watchmaking kit is perfect for any aspiring watchmaker or anyone who loves to DIY and tinker around. You’ll be rewarded with a unique timepiece you will be proud to wear everyday!

Want to take it to the next level? All our watchmaking kits are designed with watch parts that are compatible with our huge existing catalog of designs and parts to further personalize your custom watch. 

All our DIY Watchmaking Kits are powered by Seiko NH Automatic Movements, which are one of the most popular automatic mechanical movements on the market. These reliable and robust workhorse movements are used by countless watch modders and microbrands alike.

Difficulty Level: ★★★★
Time Required: ~60-120min

Watch Dimensions:

  • 39mm Case Diameter
  • 47.5mm Lug to Lug Diameter
  • 20mm Lug Width
  • 13.5mm Thickness
  • Water Resistance: 100m with proper installation

What's Included?|

Complete Watch Components:

  • NMK939 Fifty-Eight SKX007/SPRD Watch Case Bundle: Steel Finish
  • Caseback: Sterile Slim Caseback
  • Bezel: Ultra-Slim Line Coin Edge Bezel for SKX007 Sloped Bezel Inserts
  • Bezel Insert: SKX007/SRPD Steel Vintage Sub Style
  • Watch Dial: Fifty-Eight Black/Gold (C3 Green Lume)
  • Top Hat Sapphire Crystal (Clear AR)
  • Watch Hands: Mercedes Gold Finish (C3 Green Lume)
  • Crown: Bundled sterile crown with pre-cut movement stem
  • Movement: NH35A from SII - Hacking and Winding movement
  • Bracelet: NMK939 Female End Link Brushed Oyster Rivet Bracelet 

 Step-by-step instruction manual
- Option:
Complete Set - Inclusive of toolkit with all the watchmaking tools required or
Parts Only - With no toolkit included, for those who already have all the required tools

Parts Compatibility:

Compatible with all our hands, dials, casebacks and rotors for endless personalization possibilities!

Free International Delivery
  • Yay! This product is eligible for free or discounted express international shipping. Shipping costs will be automatically deducted at checkout.

Customer Reviews

Based on 55 reviews
L. (São Paulo, BR)
Great watch

The watch is beautiful and the kit helps a lot first time builders.


Absolutely stunning dress watch


Over all I love what I got. Enjoyed the experience of putting the watch together. Don't like the strap, going to order a bracelet. Going to pick a couple more dials to see which one fits me best. Worth the money. Automatic mechanical watch for little cash.

Katie B. (Erie, US)
Excellent Birthday Present

I got this kit for my boyfriend for his birthday and he loved it! He had a great time putting it together and it looks great, very stylish. I would definitely recommend this

Sam (Riverside, US)
QC Issues

Certified noob here. I chose to try a kit just to test the waters. Parts are gorgeous but I was given two different length crown stems: a super short cut one that's too short with bad threading, and a long one that honestly is probably a blank.
Repeating that I'm new but dang, I must've spent additional hours because of just this problem. Very frustrating; not sure this is for everyone. Clearly if you found this website though, perhaps it is so just be prepared to cut your own parts even on "pre-made" kits