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Seiko Caliber V157

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ManufacturerSeiko
Caliber NumberV157, V157A
TypeSolar Powered (quartz)
Diameter28.6mm
Casing Diameter
24mm
Thickness
3.5mm
Total Height
5.8mm (to top of pinion)
Jewels
2
Frequency
32,768 Hz
Integrated Circuit
C-MOS-IC
Capacitor Number302324Y
Stem351892 (tap 11)
Hacking Seconds?
Yes
Hand Sizes1.10mm / 0.65mm / 0.20mm
FunctionsHours, minutes, central seconds, date at 3:00 (4:00 on the Street Series models)
Country of ManufactureJapan
Known Models Seiko SNE541, SNE543 (add more in the comments below…)

The Seiko caliber V157 (actually marked V157A) is found in some Seiko solar-powered watches, including the exclusive Street Series Solar Divers.

V157 VS V157A:

The movement in your timepiece may actually be signed with the caliber number V157A. As with most (if not all) Seiko movements, the trailing letter indicates the evolution or change-log of the movement, starting with A as the first release. Therefore, V157 is the same as V157A. As of this post, there is not a V157B, V157C, and so on.

V157 VS V158:

There is a similar Seiko caliber V158, with the main difference being that the V158 has a day/date window at 3:00, and the V157 only displays the date at 3:00.

Accuracy:

Seiko claims that the caliber V157 will maintain accuracy of +/- 15 seconds per month at normal operating temperatures of about 5C to 35C (41F – 140F).

Battery Change:

The caliber V157 is a solar powered watch with a manganese titanium-lithium rechargeable capacitor. It is not a normal battery. The number is MT920, or more specifically: 302324Y. Order one here

Charging Times:

The chart below shows how long different lights sources can take to fully charge the cell in the V157. This ranges from 120 hours to 9 hours of constant light source. A full charge can last up to 10 months.

Seiko Caliber V157 Charging Times

Interesting Note:

Although there is an instruction manual for dive watches with caliber V157 or V158, there is also another instruction manual that combines the following calibers: V110, V111, V114, V115, V116, V137, V145, V147, V157, V158, V181, V182, and V187.

Examples of watches with V157:

 

Additional Resources:

  • Seiko official instruction manual is here
  • Shop for the Street Series Solar Diver here
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Ricky
Ricky
5 months ago

Mine’s running within +15 seconds per month but there must be a bit of play in the gear train as it sometimes hits the indices and sometimes doesn’t. (Seiko Street Tuna SNE535P1)

John Lind
John Lind
1 month ago

It’s not a “capacitor”, it’s a rechargeable *BATTERY*. I wish you’d get the technical terminology correct. Capacitors are inherently *NOT* rechargeable, nor are they long-term energy storage devices. Sheesh!! Seeing this misuse of the term is like hearing fingernails screeching across a blackboard at 150 dB.

Yurri
Yurri
30 days ago
Reply to  John Lind

Your comment is like fingernails on a blackboard. In solar powered watches, the rechargeable battery you refer to is called a capacitor. Literally the first sentence on the Wikipedia page for capacitor is: A capacitor is a device that stores electrical energy in an electric field. Search 302324Y and see it’s called a capacitor not just by this site. You should email Casio and Seiko to complain. https://www.google.com/search?&q=watch+capacitor

John Lind
John Lind
30 days ago
Reply to  Yurri

When you’ve got a graduate degree in electronics and electrical engineering from a top ten university engineering graduate school, in addition to the highest class of FCC license requiring extensive knowledge about circuit design, the active and passive components used, their principles of operation and how they’re fabricated and constructed internally, THEN come back and DARE to lecture me about what a battery and a capacitor are. These watch movements use rechargeable BATTERIES. Period. They… Read more »

John Lind
John Lind
30 days ago
Reply to  Yurri

This V157 movement uses a Panasonic MT920 rechargeable Lithium BATTERY with a specific set of contacts welded to it for use in the V157 movement. This is the most common rechargeable BATTERY used in kinetic and solar watch movements. Variants are made with the MT920 with different shape contacts welded to them to make contact with electrical pads on circuit boards in specific movements. https://industrial.panasonic.com/ww/products/batteries/secondary-batteries/coin_rechargeable_lithium/models/MT920 There’s no such thing as a “rechargeable Lithium capacitor”. Doesn’t… Read more »

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Seiko Caliber V158 Watch Movement | Caliber Corner
30 days ago

[…] is a similar Seiko caliber V157, with the main difference being that the V157 only has a date window at 3:00, and the V158 has a […]

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