[water70proof]

Still my 6138. I adjusted the regulator slightly, and as of this morning it's been running an absolutely consistent +4/day over the past four days (Ken Setser just serviced the movement). The old Seiko chrono movements are capable of fine accuracy and consistency.

 

[water70proof]

Fairly smooth, same as other 21,600bph Seiko's seconds hands (6 beats per sec.).

Paul