ED209[Purist]
7307
spring drive and minute repeater
Interesting to know that Seiko chose to power their sonnerie and minute repeater with spring drive movements. But it does make sense to do this. Great report on the movements.
Regards,
ED-209
Amazing report!
By: rnaden : October 20th, 2014-04:22
It's equally amazing that Seiko builds just about everything they need, and winding the hairspring in just a few minutes?? WOW! Thanks for this great report. It has certainly increased my appreciation for Seiko, particularly their Grand Seiko line. In fac...
Hi Richard
By: cazalea : October 20th, 2014-07:48
Thanks for the kind words. I have to say that he is not actually winding the mainspring, but is aligning it and adjusting the final position and curve. This is a great achievement in itself. Keep reading! Cazalea
ADDENDUM to SPRING DRIVE
By: cazalea : October 20th, 2014-08:36
Hello again. I've been struggling through some patent documents this morning in an effort to understand the Spring Drive's torque return system. ( feel free to join me; they are HERE ) I had noticed some extra wheels on the movements and wondered what the...