For VK63A Quartz Chronograph Movement 30.8mm with Adjusting Stem for VK SERIES Single Calendar: Measure Your Old Movement Before Ordering

This is a quartz chronograph movement made for the VK63A layout used across the VK SERIES, 30.8mm in diameter, supplied with an adjusting stem and configured for a single calendar window. It is a replacement for a dead or dying movement, not a retrofit for a different calibre. The measurements that decide whether it drops into your case are the ones you take from the old movement first: overall diameter, movement holder ring size, dial feet position, hands post heights, and where the calendar window sits on your dial. None of those case-specific dimensions are listed beyond the 30.8mm figure, so a dial cut for a date at another position will not line up. Quartz chronograph movements also differ in how the chronograph hands reset, and the stem included may still need cutting to match your crown. Battery type is not specified on the page — ask the seller which cell it ships with and whether hands are included, because some sellers offer the movement bare.