Seiko (SII) Caliber NH35A

The Seiko/TMI/SII caliber NH35 (NH35A) is a hand-windable, hacking upgrade from the Seiko caliber NH25A (read: NH25A vs NH35A). The earliest documentation on this movement that we were able to find was issued on 2/14/2011, this also corresponds with the 2011-2012 time frame that the first NH35A powered watches started hitting the market. The NH35A is currently one of the world’s most popular automatic movements and is widely available in many affordable/microbrand watches. Time Module aka Seiko Instruments labels the NH calibers as part of the “Basic Mechanical Movement” Series. They also have NE calibers that are labeled as “Premium” Mechanical Series. Some of the topics covered in this caliber listing: NH35A Also Known As… Winding the Mainspring Crown Position Functions Reference Variations DIY NH35 Rotor Removal/Install New Country of Origin Mystery Are there fake NH35 movements? Examples of NH35 Powered WatchesNH35 Custom Rotor It’s also important to note that the Seiko NH35A movement is basically an unbranded version of the Seiko caliber 4R35. for example, the NH36 is an unbranded version of the 4R36 (day + date) found in the Next Generation Orange Monster. Read: NHXX caliber differences. In the technical documentation, Time Module claims that the NH35A accuracy range is within -20~+40 seconds per day under normal conditions. They recorded these accuracy measurements without the date complication being active. This shouldn’t have any noticeable bearing on the accuracy, but it’s interesting nonetheless. Note: When you attempt to get a measurement of your watch’s accuracy with a timing maching, it’s important to make sure your watch is fully wound or the lack of power reserve may skew the test results. TMI states that measurements should be done within 10-60 minutes after the movement is fully wound up. So what does fully wound up mean? The NH35A should be fully wound after about 55 manual turns of the crown.

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