4/26/2023 0 Comments Seiko instruments inc![]() The cell number for replacement is 371 ( SR920SW). There is no way to regulate or adjust this movement. Seiko/Time Module states that the expected accuracy of this calibre is +/- 15 seconds per month at normal operating temperatures of -5C to + 50C (23F – 122F). “Centre second hand moves 4 times per second, resembles mechanical movements.” Accuracy Rating: The seconds on a VH31 sweep at 4 beats per second (2Hz) which is slower than a typical automatic (for example the NH35A beats 6 times per second), but much smoother than a regular 1 beat per second quartz. Sweeping Seconds:Īs a mecaquartz type of movement, the second hand on the VH31 has a rather smooth sweeping motion, unlike most quartz watches that impulse with a ticking motion. At the time of this post, there is not a VH31B and may never be one if Seiko does not feel the need to change anything. VH31 is the base caliber designation and the trailing letter is an evolution or upgrade indicator, A being the first version produced. What is the difference between VH31 and VH31A? Nothing. ![]() ![]() ![]() Some of the topics covered in this caliber listing:
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