Good old Seiko watches, they just keep going with some care.
My brother's Seiko Sportsman, Diashock, 17 jewels, purchased at the PX in Viet Nam, circa 1967 or 1968. On the back is what I assume is a serial number - 6N02823. Given to me as a Christmas gift in 2010.
Battle tested and still running 45 years later.
The band is not original, as it is made in China.
Regards.
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Good old Seiko watches, they just keep going with some care.

Here's a 6217-7000 World Timer that was given to me in the 80's by a friend who had no use for wristwatches. It's my only Seiko. Indeed my only Japanese watch.
For years I didn't wear it because the crystal was so crazed it was hard to read. The crystal's replaced now but I would like to find an original band. I don't like the way it looks on a leather strap. This is a first run Tokyo Olympic model. You can just make out the etched logo on the back.
It's unfortunate that Seiko didn't make the markings more durable. It keeps great time, never been serviced afaik. An impressive feat. Joel
This is my Seiko 'S' with a Seikosha movement and a glass back, it was made around 1948.
The outer portion between the dial and the case is cut-away between the hour batons.
I also have a 1940's Super with a Seikosha movement.
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The seiko automatic I had when did Seiko start putting "5" in a shield on the dial? Mine did not have this "5", did not remember the movement ID but i know it had classic patented weight gear and a gear cam (1:1 with alignment marks) with ratchet claws with cam that wind ratchet wheel, with pinion to turn mainspring gear. The oscillating weight is 180 degree mass type not the later 100 degree type.
Cheers, Watchfixer