I set up my PD1644 (Seiko vk63) 15 days ago and still running + - 0 seconds. I'm amazed how accurate this movement is. Is it normal? : r/ChineseWatches
Hattori Japan Quartz Chrono Watch Movement VK63 Overall Height 7.5mm
New Japan Seiko SII / TMI / Epson VK63 Watch Movement, 13 1/2 Ligne, 3 Hands | eBay
Genuine Seiko SII Epson VK63 Watch Movement Japan 3 Hands, Date at 4.5 Angled | eBay
Seiko (SII) VK63 Mechaquartz Watch Movement | Caliber Corner
Seiko VK63 Ocean Blue Chronograph – Seiko Creations
VK63 mod - looks better than a MoonSwatch in my opinion : r/SeikoMods
Seiko Mod Seitona Silver dial Rubber Mod - Seiko VK63 Mechaquartz Move – Alpine Mods