Seiko, really, wow? I don't have any manual or Kenetic Seikos, but my quartz are my most accurate by far.
I love this Sportura from the 90's I bought NOS.
It's said to be accurate down to 1/100 sec, that's that sub-dial at 12 o-clock. It's really cool to watch because that little hand spins so fast it's just a blur til it stops.
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The Seiko is a less than $100 automatic, I think using an in-house mechanism. It will go maybe a week before it is off enough that it needs reset.