Miyota 90s5 Front Back

Miyota Caliber 90S5

Miyota Caliber 90s5

Manufacturer Miyota (Citizen)
Caliber Number 90S5
Movement Type Automatic, self-winding
Lignes 11 1/2”’
Diameter
26mm
Thickness 3.90mm
Total Height
5.64mm
Jewels 24
Vibrations Per Hour
28,800 bph
Anti-Shock System Parashock
Power Reserve
42+ hours
Rotor Direction
Uni-directional (clockwise)
Lift Angle 51 degrees
Stem 065-A05 (tap 10)
Dial Screws 929-808
Case Clamps
082-060
Case Clamp Screws
924-752
Hand Sizes
1.52mm / 1.00mm / 0.17mm
Hand Windable?
Yes
Hacking? Yes
Functions Central hours; central minutes; central sweeping seconds; open balance wheel dial at 5:00
Country of Manufacture Japan
Known Models Kurono Toki, Kurono Mori, Kurono Seiji, Kurono 34mm, Lorier Neptune Series IV, Lorier Falcon Series III, Aevig Huldra (Add yours in the comments below…)
Credit
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The Miyota caliber 90S5 is a member of 90/91 family of watch movements. This caliber is part of Miyota’s “Premium Automatic” line. It tells the time via a traditional 3 hand display with no date option. The unique design element of this movement is that it has an open-heart (aka open balance wheel) on the dial around the 5:00 position. This movement has 24 jewels and is made in Japan.

Miyota 90s5 Front Back

Time Setting:

The caliber 90S5 is a no-date movement so the crown only has two positions: winding (position 1) and time adjusting (position 2). The set the time on your 90S5 powered watch, pull the crown out one click to position 2. You may need to unscrew the crown if it is a divers style watch with a screw-down system.

Winding + Power Reserve:

Winding the movement 15-20 clockwise will start the movement. To fully wind the movement, turn the crown 40 times. The power reserve when the movement is fully wound is supposed to be more than 42 hours.

Accuracy:

Miyota claims that the caliber 90S5 offers accuracy of -10 ~ +30 seconds per day. This is measured within 10-60 minutes from a full wind via the crown.

Replacement Prices:

At the time of this post, caliber 90S5 replacement prices were found online in the range of $99.00 – $115.00 USD.

90S5 VS 9029:

There is a similar and more common Miyota caliber 9029. Both are 26mm in diameter, have 24 jewels, both beat at 28,800 vph, and have the same dial feet location. The main difference is that the 9029 is a 2 hand watch without a sweeping second hand. Also, the 90S5 has a decorated gilt front plate that may add to the aesthetics of the open balance feature depending on the dial design.

Miyota 90s5 Vs 9029

Usage in Microbrand Watches:

At this time, there are still only a few brands using the Miyota caliber 90S5 in their watches. One interesting example of this is the Kurono Mori and Toki (retail price $1,738 USD). Why this is interesting is because this caliber’s specialty is its “open-heart” on the dial side, however, neither of these watches have a cutout on the dial for a view into the swinging balance wheel. Also, neither model features an exhibition style caseback to see the movement.

Kurono Tokyo’s website says this about their choice of movement:

“For the movement, Hajime chose the calibre 90S5 – Miyota’s highest end movement from its Premium series. Balancing affordability with over-the-top construction quality, the cal.90S5 is made in Japan, features a stop-seconds automatic mechanism with a 42 hour power reserve. Kurono is proudly made in Japan, assembled by hand. ” –Kurono Tokyo

Miyota Caliber 90s5 Kurono Tokyo Watch

The Miyota caliber 90S5 is part of the 90 series of movements which includes the 9015, 9019, 9039 and 9029. While the 90S5 does feature a greater level of finishing on the dial side with a decorated gilt plate, it is mainly because of the open balance wheel which the Kurono watches does not make use of.

Watch enthusiasts are used to brands using date movements in no-date watches, causing a phantom date mode with a clicking datewheel that serves no purpose, but we’re not used to a watch with an open balance and a solid dial. It seems that Kurono could have simply used the Miyota 9039 which has the exact same specs, no date, and looks identical from the rotor side of the movement – all without an open-heart design.

With the extra finishing and the open balance design, the 90S5 appears to be the highest priced caliber in the 9 series. As mentioned, it is also not found in many watches yet. Perhaps these are part of the reasoning behind the brand’s choice.

Additional Resources:


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Ross
Ross
1 year ago

Annoyingly loud rotor 🙁

joe
joe
1 year ago

Mine runs +1 sec a day. Not bad.

Glenn Szychulski
Glenn Szychulski
10 months ago

This movement is used in the Tisell’s Marine Diver and Submersible Vintage. I own both and they are great watches, I have had no issues at all. Quality for sure!

Daniel
Daniel
10 months ago

Good movement but the rotor noise is just massive.

David
David
9 months ago

Used by Kurono.

WARREN KULLICH
WARREN KULLICH
3 months ago
Reply to  David

WHAT DID KURONO SELL FOR NEW HOW IS THE MOVEMENT

DAN
DAN
1 month ago
Reply to  WARREN KULLICH

Good luck finding a Kurono for under 2 or 3 thousand dollars. I also want one, but I also want to see the movement inside to see if they did anything to it for that price.

trackback
Reseña Lorier Falcon Mark II - SaFonaGastroCrono
5 months ago

[…] pequeño reloj de estilo “vintage” está impulsado por el delgado y fiable Miyota 90S5 que late a 28.800 vph (4 Hz) y ofrece 42 horas de reserva de marcha. El movimiento está alojado en […]

David
David
5 months ago

2022 RZE Resolute

Tony
Tony
3 months ago
Reply to  David

Looking the Resolute for months. Likes, or dislikes? Bracelet?

trackback
Miyota Watch Movements (List) Watch Movement | Caliber Corner
3 months ago

[…] 90S5 – […]

Isa
Isa
1 month ago

This movement will also be used in the upcoming Xeric Scrambler Automatic watch.

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Vincero Marble Automatic Review (2022): Building an Empire?
1 month ago

[…] Watch experts are happy to recommend brands like Kurono (a cool Japanese micro-brand), who also use this same exact movement, but cost about three times as much. Obviously, there’s a lot more to a watch than just the movement and the design—other factors like a domed sapphire or type of bracelet can make a huge difference in cost.  […]

trackback
Vincero Marble Automatic Review (2022): Building an Empire? – My Blog
1 month ago

[…] Watch experts are happy to recommend brands like Kurono (a cool Japanese micro-brand), who also use this same exact movement, but cost about three times as much. Obviously, there’s a lot more to a watch than just the movement and the design—other factors like a domed sapphire or type of bracelet can make a huge difference in cost.  […]

Francesco
Francesco
24 days ago

Used by GORILLA watches as last model NOMAD

;
Venus Caliber 178

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