Miyota Caliber 9000 watch movements.
Miyota is the watch movement division of Japan's Citizen Watch Co., Ltd. Miyota's Caliber 9000 series are mechanical movements built to compete with Swiss ETA, whose movements are commonly used in high end luxury watches. I own a Parnis wrist watch with a Miyota 9100 movement. This is the movement with the most "complications" in the 9000 series: it has the time, day, date, month, a synchronized 24 hour hand, and a top mounted power reserve indicator. I have read that it retails for about $120 but you can buy it in quantity for $80. My Parnis usually sells for $200–$220, but I was able to buy one on sale with an good eBay coupon for $160.
It ran 4+ seconds/day when I bought it, but it does better than that now and it is the most accurate mechanical watch I own. If you are shopping for a micro brand mechanical watch, look for one with a Miyota Caliber 9000 movement: you are most likely to see 9015 and 9039.
Edit 12/24: I set my watch today and it's still running 4+ seconds/day. That's not up to the early 20th century railroad standard of +/– 15 seconds/week, but for an affordable 21st century watch it's pretty good.
Parnis sells 9100 movement watches with a readable date complication instead of a power reserve indicator. Power reserve is not that important with a hand winding movement.
The only other affordable I've found with this movement is Aragon's Divemaster 9100, when they have it in stock
and on sale. Today it's $199.88, 50 MM case only.
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