Miyota 90S5 Premium Automatic Watch Movement
The Miyota 90S5 is a premium Japanese movement widely used in top-tier microbrands for its durability and slender profile.
Measuring only 3.9mm thick, it is 30.8% slimmer than the Seiko NH35, enabling sleeker watch designs. With a higher accuracy and a superior beat rate of 28,800bph which gives the second hands a smoother sweep, the Miyota 90S5 offers a premium option for watchmakers aiming to craft high quality timepieces.
The Miyota 90S5 also has an open-heart design (aka open balance wheel) on the dial around the 5:00 position which allows for builds with open heart dials!
Comes supplied with watch stem.
Specifications:
Manufacturer: Miyota
Caliber Number: 90S5
Movement Type: Automatic
Jewels: 24
Vibrations Per Hour: 28,800 bph
Shock System: Citizen Parashock
Accuracy: -10~+30sec/day
Power Reserve: 42 hours
Winding Direction: Bi-directional
Height: 3.90mm
Functions: Stop second device, Automatic and hand winding, 3 Hands, Open-Heart
Dial Compatibility: Compatible with all 28.5mm Seiko Dials (to cut off all 4 feet and use dial dots for installation) without date windows.
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Customer Reviews
I picked up this Miyota 9015 from Namoki at the beginning of this year. This is my first build with the movement and I was a bit worried about using it versus the NH series. I was very happy when I got to building to see how straight forward it was. The movement came running within spec from the factory. Mine sits at about +10 seconds per day which is well within spec. During the build, I definitely made some slips and beat on this movement but it kept running perfectly.
I would highly recommend building with this movement. Disclaimer for my build, I have a custom movement holder to fit the SRPE case but aside from that, the movement is great.
The finishing and operation of the 9015 movement is definitely a few levels above the NH35. It is not as user friendly as the NH35 though and I would only recommend for more experienced builders