From the factory, they can be easily distinguished by checking the engraving on the automatic rotor.
The NH35a has two variations, manufactured in either Japan or Malaysia. Manufacturing Variations: Japan and Malaysia Its reliability, for such an affordable movement, is one of the reasons it is so highly regarded. The NH35 movement is a reliable, workhorse movement that is not known to have any recurring issues. This is due to the inclusion of plastic parts which reduce the need for frequent lubrication for maintenance. The NH35 is based heavily on the workhorse Seiko 7S26 movement which is known to last upward of 5-25 years without ever needing a service. However, most NH35 owners find their movements to run much more accurately, often between -/+ 1 second to -/+ 10 seconds per day. The NH35 has a rated accuracy between -20 to +40 seconds per day under normal conditions.
Only then are they tested and selected, and only quartz oscillators that meet strict standards are used in the 9F quartz movement. Grand Seiko was the first watchmaker in the world to utilize quartz oscillators selected through this process.Īs part of the process, quartz oscillators made in-house are first 'aged' for three months, during which they are subjected to certain voltages so that their characteristics stabilize. Recognizing this, Grand Seiko introduced an aging process for its chosen crystals to ensure that the oscillators stabilize before being used. Other oscillators may perform with high precision at first, but undergo change in their oscillation over the years leading to inaccuracy. The accuracy of a quartz watch depends on whether the quartz oscillator can maintain a precise rate of 32,768 oscillations per second.ĭespite the overall regularity of this oscillation, each quartz oscillator has different performance characteristics, with some unable to maintain stable performance during the course of long use and changes in the environment. This is made possible by the selection of highly stable quartz crystals that are put through a rigorous aging process. QUALITY The 3-month aging process for quartz oscillatorsĬaliber 9F delivers an exceptional precision rate of ☑0 seconds per year.
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