Sankyo Digi-Glo clock from 1970s
Has now been running consistently for some hours, with the once a minute
motor drive.
With balance wheel spring adjuster mid position and main spring fairly
loose but enough to drive the escapement, about 2 sec per minute slow.
With the mainspring tight , so having a regular cylinder form, rather
than the sloppy looking form when loose, gains about 1sec per 5 minutes.
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