Hi,
This is my first post.
Here is my Seiko 5S21-6000.
What make this different from other quartz watches is of it's sweeping seconds. May be a poor man's "Spring Drive"
Accuracy about +/- 15s /month
7 Jewels with hacking functions, 34mm
Manufactured in 1988.
https://www.youtube.com/watch?v=zWHxlPXUlqASent from my SM-N910C using Tapatalk