It was the basis for the popular 7S26 family, and its descendants remain in production today.
The family operated at the same 21,600 A/h still used by midrange Seiko mechanisms and all offered 43 hours of power reserve.
and original luminous markers are clean and bright, showing no signs of refinishing or re-luming.
Original Seiko handset is clean and matches dial perfectly.
Hattori quickly recognized the growing worldwide popularity of the wristwatch and predicted that the demand for wristwatches would shortly outpace that for pocketwatches.