Kinetic Perpetual, it combines the beauty of a classic mechanical perpetual calendar, correct until February 28, 2100, with the advantage of Kinetic - no battery change, perpetual quartz accuracy, and up to 4 years autonomy when not worn.
This caliber is a triumph of classical watch-making and modern microelectronics. With 232 parts, which is almost the same number as other high-class mechanical chronograph watches, and the world's smallest ultra-sonic motor, just 0.4 mm thick, the Kinetic Perpetual caliber sets a new standard in Perpetual Calendar watches.
This 0.4 mm thick ultra-sonic motor is the only motive energy for the 101 parts in the mechanical gear trains of the Perpetual Calendar which correctly displays not only date and day, but also months, including February of leap years.
This remarkable calendar is also governed by a photo sensor, which recognizes a certain mark on each gear and judges, and corrects the date, day, month and year, including February of leap years.
The caliber also incorporates SEIKO's unique Kinetic Auto-Relay technology. No battery change is ever required, and yet Kinetic Perpetual offers quartz accuracy and reliability. With Auto-Relay, the watch will, when not worn, operate normally for 6 months on a full charge, after which it goes into "sleep" mode for up to four years. The accuracy remains and the calendar continues to show the correct date, month and year, but the hands stop, conserving energy, until, once the watch is put on again, the hands automatically reset to the correct time.
Caliber Specification (Caliber 7D48)
Perpetual Calendar, correct until February 28, 2100.
Kinetic power delivers quartz accuracy with no battery change.
Auto Relay system preserves accurate time for up to 4 years.
Integrated displays of date, month, leap year and 24 hour time.
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