An early Seiko AGS kinetic model, model number 5M42-0E50, that we have fitted with a new capacitor.


We can date this to being produced in April 1987 from the serial number on the watch back.


​First a history lesson.  Seiko launched the AGS (Auto Generating System) as the first quartz powered watch to recharge itself.  Inside the watch is a rotor, just like found in fully automatic watches, but this one charges the capacitor that powers the watch.  This was soon rebranded Kinetic, so early AGS watches are sort after. More information can be found here on Seiko’s own website.  Interesting they say that the watches were launched in 1988, but this is a 1987 model.  This may be because we sourced this watch from Japan, so the launch there could have been earlier.

This actual watch needed a new capacitor, which we fitted using genuine Seiko parts.  The top pusher uses the second hand to show how much charge is remaining, and now the charge is good.  after a couple of days the watch will go into sleep mode, where the hands stop moving.   A few shakes and the watch not only starts again, but sets the correct time (based on when it entered sleep mode – it keeps counting the seconds even though the hands don’t move).  The case has a few minor marks but these could be polished out if needed.  The solid link bracelet is good, as is the crystal.

Please see the HD video below for more details.


Approximately 38.3 mm wide including the recessed crown, 11.7 mm thick. Takes a 18mm strap.  The bracelet will fit a maximum wrist size of 185 mm


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