Seiko 4T53

The Seiko caliber 4T53 is a Japanese-made quartz chronograph movement with a 3-6-9 subdial layout and 371 jewels. It uses an SR920SW battery and is Seiko's in-house version of the VD53 caliber, meaning it appears only in Seiko-branded watches. The movement's distinguishing feature is its central running seconds hand—a configuration that places the chronograph seconds hand in a subdial rather than the center, reversing the typical chronograph arrangement.