This ranges from 120 hours to 9 hours of constant light source. The chart below shows how long different lights sources can take to fully charge the cell in the V158. The number is MT920, or more specifically: 302324Y. The caliber V158 is a solar powered watch with a manganese titanium-lithium rechargeable capacitor. Seiko claims that the caliber V158 will maintain accuracy of +/- 15 seconds per month at normal operating temperatures of about 5C to 35C (41F – 140F). There 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 day/date at 3:00. As of this post, there is not a V158B, V158C, and so on. As with all Seiko movements, the trailing letter indicates the evolution or change-log of the movement, starting with A as the first release. The movement in your timepiece may actually be signed with the caliber number V158A. Some of the topics covered in this caliber listing:
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