NMK-WK19 DIY Watchmaking Kit: "Billy Airfield" by BBmod


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namoki x @bbmod_watches

Creator: Billy of BBMod_watches

Creator Notes: I selected these components with the aim of designing a watch that draws inspiration from classic field watches while embracing a modern style.
This watch prioritizes readability with a clean dial and durability with a 316L stainless steel case. A screw-down crown ensures water resistance up to 100 meters.
The 38mm diameter of this watch is suitable for most wrists, and its appearance can be completely transformed depending on the strap you choose.

Our DIY Watchmaking Kits will have you building your own "Billy Airfield" Pilot 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:

  • 38mm Case Diameter
  • 46.5mm Lug to Lug Diameter
  • 20mm Lug Width
  • 11mm Thickness
  • Water Resistance: 100m with proper installation

What's Included?|

Complete Watch Components:

  • NMK931 Field Watch Case Bundle: Steel Finish
  • Caseback: Sterile Slim Caseback
  • Bezel: Integrated Bezel
  • Watch Dial: B&R Pilot Black
  • Flat Sapphire Crystal (Clear AR)
  • Watch Hands: Nautilus Steel Finish
  • Crown: Bundled sterile crown with pre-cut movement stem
  • Movement: NH35A from SII - Hacking and Winding movement
  • Bracelet: 20mm Green NATO Strap

 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