Grand Seiko

Grand Seiko 9SA5 power reserve: 80 hours

The Grand Seiko 9SA5 is an automatic movement that runs for about 80 hours (about 3.3 days) from full.

Found in

Grand Seiko Evolution 9 SLGH, White Birch

Keeping it running

• On an average day an automatic gains roughly 4 hours of reserve per hour on the wrist, so about 20 hours of wear fills the Grand Seiko 9SA5. Desk days charge more slowly.
• Most automatics can also be wound by the crown. If yours has stopped, a few dozen turns gets it going before you put it on.
• Off the wrist it stops about 80 hours after it was last full.
• If it does stop, don't set the date between 9pm and 3am. Here's why.

Never let it stop

Watch Winder counts down the reserve of every watch you own and reminds you before one stops. It already knows the Grand Seiko 9SA5: type your watch's name and the reserve fills itself in.

Manufacturer's published figure. Real reserve varies with the watch's age and service; check your manual.