Seiko · Seiko 4R57 power reserve

Seiko Presage Cocktail Time power reserve models (SSA343, SSA459): inside the 4R57

The Seiko Presage Cocktail Time SSA343 and SSA459 and the Style60's SSA447 run on Seiko's 4R57, which shows its own reserve on the dial. From a full wind it runs about 41 hours, or 1.7 days.

Updated September 2026 · Based on manufacturer specs, published reviews and watchmaker/owner reports

Watches that use the Seiko 4R57

If your Presage has an arc-shaped gauge running from 12 o'clock towards 4 and a pointer date in a subdial at 6, it has a 4R57. It's the most useful of Seiko's affordable complications for anyone who rotates watches, because the watch tells you how much running time is left. You'll find it in the power reserve versions of the Cocktail Time and Style60's, and in a run of earlier Presage models.

Specs at a glance

History and where it came from

The 4R57 turned up in Seiko's 2016-2017 catalogue in Presage special editions, and Seiko put it into the Cocktail Time in 2017. The SSA343 launched in mid-2017 with an ice-blue dial. It uses the same 4R base as the 4R35: the same 3 Hz balance, the same kind of mainspring and the same 41-hour reserve. Seiko then added two displays that the standard movement lacks.

The first is the power reserve indicator. Seiko's parts list shows a small differential gear train (a sun-and-planet unit and a planetary reduction wheel) that tracks how far the mainspring is wound and drives a hand across the dial. The second is a pointer date instead of a date window, which gives the Cocktail Time its subdial at 6. All that extra gearing explains why the movement is bigger than a 4R35, at 29.36 mm across and 6.63 mm tall. It also has five more jewels, for 29 in total. The watches are thicker as a result: an SSA343 is 14.4 mm, against 11.8 mm for a regular Cocktail Time.

Accuracy in the real world

Seiko rates the 4R57 at +45 to -35 seconds a day on the wrist, like the rest of the 4R family. The service guide sets the workshop limits at +25/-15 s/day dial-up when fully wound, +35/-25 in the vertical positions, and ±30 for the drift from fully wound to 24 hours later.

Seiko's 4R57 manual adds a useful tip: accuracy may suffer if the watch runs for long periods with 20 hours or less on the gauge. It recommends keeping the reserve between 20 hours and full. That's true of most automatics. The 4R57's gauge just lets you see it happening.

With the same balance and escapement as the 4R35, you can expect similar results. Owners of 4R movements commonly see a few to 20 seconds a day fast, with variation from watch to watch. It has a conventional regulator, so a watchmaker can adjust it quickly.

Reliability and servicing

The core of the 4R57 is the well-proven 4R, with Seiko's Diashock shock protection and no known weakness of its own. The power reserve and pointer date modules add parts, so a full service takes a little more work than on a 4R35. Seiko service centres handle it routinely.

Swapping in a cheap NH35 isn't an option, because the gauge and pointer date need the 4R57's extra gearing. A dead 4R57 needs a repair or a replacement 4R57. That's rarely a problem, but it's worth knowing before you buy a well-used SSA343.

Quirks worth knowing

• Reading the gauge. Near 40 or F means fully wound, about 41 hours. As the spring runs down the hand moves towards 0 or E. Seiko notes it can go slightly past 0, which isn't a fault.
• Three crown positions. Pushed in, the crown winds (clockwise only). At the first click, turning it counterclockwise sets the date. At the second click, you set the time and the seconds hand stops.
• Date danger zone. Seiko says not to set the date between 9pm and 1:30am. Here's why.
• AM and PM. The date changes around midnight. When you set the time, advance the hands until the date changes, and you know you're past midnight.
• Short months. The pointer date doesn't know month lengths, so correct it after February and the 30-day months.
• Thickness. At 14.4 mm, the power reserve Cocktail Time sits noticeably taller than the date-only version. Check it fits under a shirt cuff.

How it compares

• Seiko 4R35 / 4R36: the same base with a date window and no gauge. It's thinner and cheaper, with the same 41-hour reserve.
• Seiko 6R27: the step-up Presage calibre with a date and power reserve and a 45-hour reserve.
• Seiko 6R21: adds the day of the week to the date and power reserve, also with 45 hours.
• Seiko 6R35: no gauge, but a 70-hour reserve that makes one less necessary.

Living with the 41-hour reserve

The 4R57 is the rare watch that tells you how long it has left, and Seiko's manual says to use it: look at the gauge before you take the watch off, and wind it if there isn't enough to last until you next wear it. Take your Cocktail Time SSA343 off at 10pm on Friday with the gauge near F and it will stop around 3pm on Sunday. Take it off with the gauge at 20 and it will stop around 6pm on Saturday.

The gauge only helps while you're looking at it. With the watch in a drawer, Watch Winder counts down the 41-hour reserve for each watch you own and reminds you before it stops. It's especially handy for an SSA459 that you only wear on occasion. To check a specific weekend, try the "Will my watch stop?" calculator.

Verdict

The 4R57 turns a 41-hour reserve from a weakness into something you can manage, because the dial shows you exactly how much is left. It's the reason the SSA343 and SSA459 are so popular, and the pointer date suits the Cocktail Time look. The trade-offs are a thicker case, no cheap drop-in replacement, and the same loose 4R tolerance. For a dress watch that spends time off the wrist, the gauge is well worth it.

FAQ

How long does the Seiko Cocktail Time SSA343 run off the wrist?

About 41 hours from a full wind, roughly a day and three quarters. The power reserve gauge on the dial shows how much of that is left before you take it off.

How do I read the power reserve on my Seiko SSA459?

When the hand points near 40 or F, the mainspring is fully wound, about 41 hours. As it runs down the hand moves towards 0 or E, and Seiko recommends keeping it above about 20 hours for the best accuracy.

Does the Seiko Presage SSA343 hack and hand-wind?

Yes. The seconds hand stops when you pull the crown out to the second click, and turning the crown clockwise in its normal position winds the 4R57.

How accurate is the Seiko Presage Style60's SSA447?

Seiko rates the 4R57 in the SSA447 at +45 to -35 seconds a day on the wrist. Most examples run well inside that, and a watchmaker can regulate one closer.

When should I not set the date on a Seiko 4R57?

Seiko says to avoid setting the date between 9pm and 1:30am, while the date mechanism is engaged. Move the time outside that window first, then set the date.

Why is the Cocktail Time power reserve thicker than the regular one?

The 4R57 adds a power reserve train and a pointer date, making it 6.63 mm tall. The SSA343 is 14.4 mm thick, against 11.8 mm for the 4R35 Cocktail Time.

Does the power reserve hand going below zero mean my Seiko is broken?

No. Seiko notes the indicator may move slightly beyond 0 or E, which is not a malfunction. Wind the watch and the hand will climb back up.

Sources

• Seiko: Parts list and technical guide, Cal. 4R57A (PDF)
• Seiko: Cal. 4R57 instruction manual (PDF)
• Seiko: Presage SSA459J1 product page
• Yeoman's Watch Review: Seiko 4R57 Cocktail Time SSA343J1
• Grail Watch Reference: Seiko 4R57

Keeping it running

• On an average day an automatic gains roughly 4 hours of reserve per hour on the wrist, so about 10 hours of wear fills the Seiko 4R57 power reserve. 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 41 hours after it was last full. Stopped sooner?
• On a watch winder, start at about 650 turns per day, both directions. Winder settings for every movement.
• If it does stop, don't set the date between 9pm and 3am. Check if it's safe.

All Seiko movements

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 Seiko 4R57 power reserve: 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.