DIY NH39 Skeleton Watch Build | Flawless Open-Heart Mod

In this video, I’m building a fully custom Seiko NH39A open-heart watch — a movement with a visible balance wheel and a 24-hour subdial. This DIY skeleton watch build shows every step: choosing the dial and hands, fitting the movement, assembling the case, and testing the lume. The project uses AliExpress watch parts and a PRX-style stainless steel case, giving the build a clean, modern sports look. Along the way, I share some modding tips, talk about Seiko NH-series movements, and show what to watch out for when ordering parts online - because not all AliExpress specs are true. ✅ Watch Parts Case with integrated bracelet: https://s.click.aliexpress.com/e/_c4P... Dial: https://s.click.aliexpress.com/e/_c4K... Hands set: https://s.click.aliexpress.com/e/_c3A... Small hour hand: https://s.click.aliexpress.com/e/_c4E... Movement (Seiko NH39): https://s.click.aliexpress.com/e/_c3b... ⚙️ Tools: Watchmaking tool set: https://s.click.aliexpress.com/e/_oEJ... Movement holder - https://s.click.aliexpress.com/e/_oD4... Tweezers (stainless steel) - https://s.click.aliexpress.com/e/_oBh... Tweezers (plastic tip) - https://s.click.aliexpress.com/e/_c4X... Dust blower - https://s.click.aliexpress.com/e/_onh... Glass cleaning pen - https://s.click.aliexpress.com/e/_c36... Case back opener (ball) - https://s.click.aliexpress.com/e/_oFJ... Hand remover - https://s.click.aliexpress.com/e/_c4q... Dial protector - https://s.click.aliexpress.com/e/_c4s... Hand press tool - https://s.click.aliexpress.com/e/_op5... Caliper - https://s.click.aliexpress.com/e/_c3i... Gasket Silicone Grease - https://s.click.aliexpress.com/e/_c4U... Gloves - https://s.click.aliexpress.com/e/_c3C... ⏱️ Navigation: 0:00 Intro 0:54 Story of the NH39A Movement 2:26 Dial selection 3:36 Choosing a case 4:59 PRX case close-up 6:12 Hands 7:37 Watch I’m Wearing Right Now 8:05 Assembly 12:14 ChatGPT’s Thoughts 12:49 Lume Check 13:11 Budget 13:41 Outro 👉 Don’t forget to • 👍 Like if you enjoyed the build • 🛎️ Subscribe for future DIY watch projects • 💬 Comment below Thanks for watching Watch Minded! Tags: #NH39A #SeikoMod #DIYWatch #AliExpressWatch #OpenHeartWatch #AutomaticWatch #WatchBuild #WatchMinded #SeikoNH39 #NH39Build #SeikoMovement #SeikoModding #WatchProjects #PRXStyle #AliExpressFinds