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
Seiko Mod Daytona Black Dial VK63 Movement Type Quartz - mheewatchshop : Inspired by LnwShop.com
A Look at Some of Seiko's Best Movements (& the Watches They Fuel) - Geckota
VK63 Movement - Watch-Modz
SEIKO Meca Quartz Original VK63 Review -FAIL!!! - YouTube