Original Seiko coil with reference 4002010 from unused old stock (NOS). This electronic coil is compatible with the Seiko quartz caliber 7123A , a classic SQ model from the late 1970s and early 1980s. The coil is a key component of the electronic control system; defects in this area are among the most common causes of failure in vintage quartz movements.
The coil is unused, comes from long storage and is in excellent original condition – ideal for professional repair and restoration of fully functional 7123A watches.
