Miyota · Japan
Miyota 6T27
The Miyota 6T-series is the foundational mechanical line of Miyota (a Citizen subsidiary), with roots in the company's movement-making history stretching back to 1969. The 6T27 is a modern caliber within that family, currently in Miyota's active catalog, targeted at watchmakers who need a compact 8¾-ligne (19.8 mm) automatic for smaller or ladies-sized cases.
Running at 28,800 vph (4 Hz), the 6T27 punches above its size by matching the beat rate of Miyota's larger 9-series calibers. It is a no-date, three-hand movement with no hacking — the seconds hand continues to sweep when the crown is pulled to set the time. Hand-winding is supported. The near-identical sibling, the 6T28, adds an open-heart dial cutout but shares every other specification; the 6T15 extends the same platform with a quick-set date display.
Miyota describes the 6T27 as 'unadjusted,' meaning no factory regulation across multiple positions is performed — consistent with its positioning as a price-accessible OEM caliber. It competes in the compact-automatic segment alongside the ETA 2671, giving microbrand and OEM watchmakers a Japanese-made alternative at a similar size envelope without relying on Swiss movement supply.
Hz
Jewels
Reserve
In catalog
Technical specification
| Manufacturer | Miyota |
| Origin | Japan |
| Type | Automatic |
| Beat rate | 28,800 bph · 4 Hz |
| Jewels | 21 |
| Power reserve | 40 h |
| Diameter | 19.8 mm |
| Height | 5.23 mm |
| Hacking seconds | No |
| Hand-winding | Yes |
| Date | No |
| GMT | No |
| Chronograph | No |
| Accuracy (stated) | -20/+40 s/day |
1 model
Watches with this caliber
FAQ
Is the Miyota 6T27 automatic or manual?
The Miyota 6T27 is an automatic (self-winding) movement: a rotor winds the mainspring from the motion of your wrist, so it needs no battery. It can also be wound by hand via the crown.
What is the power reserve of the Miyota 6T27?
About 40 hours on a full wind — into a second day, so it keeps running overnight off the wrist. Power reserve is how long the Miyota 6T27 keeps running once you stop wearing or winding it.
Does the Miyota 6T27 hack (stop the seconds when you set it)?
No. The seconds hand keeps running while you set the time, so the Miyota 6T27 can't be synced exactly to the second; you set it to the nearest minute and let it catch up. It is a minor convenience rather than a measure of how well it keeps time.
Does the Miyota 6T27 have a date function?
No — the Miyota 6T27 has no date complication, so every watch built on it runs a clean, date-free dial. That suits symmetrical and vintage-style designs, and means one less thing to reset whenever the movement is allowed to stop.
How accurate is the Miyota 6T27?
The Miyota 6T27 is rated at -20/+40 s/day. That is a normal working range for an uncertified mechanical movement; a COSC-certified chronometer is held to a tighter −4/+6 s/day, and a watchmaker can usually regulate one closer. Real-world accuracy still depends on how each watch is regulated, worn, and serviced.
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