Just took this shot of my vintage Seiko diver:
Behind the scenes of my ghetto rig:
Warning: Spoiler! (Click to show)
This is ridiculously beautiful, what model is it?
General advise I've heard is that you should not always keep the chrono running. It causes additional wear on the movement. But, in the case of the citizen 8110A, when the chrono is stopped, there is a spring that is compressed to separate two clutch plates. So leaving it stopped can wear out that spring, leading to having the vertical clutch assembly repaired. I guess it really depends on the design of the particular movement.
That's a great looking watch.