I picked this up last year and think it looks great. I was disappointed to find that though it kept time very well it wasn't winding automatically. I recently got around to sorting it and found the pawl lever was goosed. New one was sourced and fitted and all is well.
It's a 1965 6619-9990.
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Lovely! I have a few vintage seikos but nothing older than the late 70s so far. Your one definitely looks of its decade,very nice.