This is a stunning vintage Seiko Kakume 6138-0030 chronograph that I recently serviced for a ClockSavant customer. After servicing, is now running superbly, within a few seconds a day across all positions and with fantastic balance amplitude (amount of balance swing) and beat error (evenness of balance swing.) The watch is also water resistant once again. If you visit the ClockSavant Instagram page and this post, you can see a video showing a specialized watch winder made for watchmakers to long-term test a watch’s automatic winding mechanism and the watch’s ability to function across many positions without issues.
