Not a Seiko Five, but a Seiko NH35 in a fake Explorer.
Seiko did not invent the automatic watch but they’ve perfected it.
It’s accurate within a few seconds a day, and will be until it dies, ten, twenty, thirty or maybe forty years from now—with no service at all. It could be serviced, but they’ll just pop in a new movement or toss the watch.
The wholesale cost of the movement in bulk orders is ridiculously cheap. You couldn’t pay a kid at Walmart to change a battery for the cost of a brand new movement.
Seiko makes every tiny little part, perfectly.
Most of assembly is by robotic machines, even oiling.
And Seiko makes their own oil, as well.
So long as men like watches with a balance wheel they’ll make a Seiko.