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How to choose a Miyota automatic movement
Start with the watch design, not a ranking. A day/date display, open-heart dial, small seconds, or GMT hand requires the corresponding movement and compatible dial and hands. Then compare movement height and the published figures that matter to you. For a repair or build, fit is a gate: headline specifications cannot establish that a movement will drop into a particular watch.
- Required display: date, day/date, 24-hour subdisplay, open-heart, small seconds, or GMT.
- Available space: compare movement height with the case and the full assembly requirements.
- Listed performance specifications: compare Miyota’s stated accuracy range, running time, frequency, and jewel count where published.
- Verified compatibility: check the specific case, dial, hand, stem, and relevant components against manufacturer drawings and the watch specification.
Miyota’s product pages provide specifications and feature descriptions, not controlled head-to-head tests. Accuracy figures below are listed ranges, and running-time figures are manufacturer-stated; they do not establish how an individual watch will perform in use.
Miyota automatic movements compared
| Caliber | Display or distinguishing feature | Height | Listed accuracy | Manufacturer-stated running time | Frequency | Jewels |
|---|---|---|---|---|---|---|
| 8215 | Date | 5.67 mm | -20 to +40 seconds/day | Approximately 42 hours | 21,600 vibrations/hour | 21 |
| 8205 | Day/date | 5.67 mm | -20 to +40 seconds/day | Not stated on the cited movement index | Not stated on the cited movement index | Not stated on the cited movement index |
| 8217 | Date and 24-hour display | 5.67 mm | -20 to +40 seconds/day | Not stated on the cited movement index | Not stated on the cited movement index | Not stated on the cited movement index |
| 82S0 | Three hands, open-heart | 5.67 mm | -20 to +40 seconds/day | Not stated on the cited movement index | Not stated on the cited movement index | Not stated on the cited movement index |
| 9015 | Premium thin movement, date | 3.90 mm | -10 to +30 seconds/day | Approximately 42 hours | 28,800 vibrations/hour | 24 |
| 9039 | Premium thin movement, three hands without date | 3.90 mm | -10 to +30 seconds/day | Approximately 42 hours | 28,800 vibrations/hour | 24 |
| 9075 | Central GMT hand and individually adjustable hour hand | 4.92 mm | -10 to +30 seconds/day | Approximately 42 hours | 28,800 vibrations/hour | 24 |
| 8315 | Long-reserve model; discontinued | 5.67 mm in Miyota’s 2024 English catalog | Not stated in the cited 2024 catalog | 60 hours in Miyota’s 2024 English catalog | 21,600 vibrations/hour in Miyota’s 2024 English catalog | 21 in Miyota’s 2024 English catalog |
Specifications are from Miyota’s 8215, 9015, 9039, and 9075 product pages, its movement index, and its 2024 English catalog. “Not stated” means the cited index or catalog did not provide that figure; consult the individual current product documentation for other models.
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Which caliber fits which design?
8215: a standard automatic with date
The 8215 is a straightforward comparison point when a watch needs a date and does not require a thinner premium movement or a specialized display. Miyota lists automatic and hand winding, quick date setting, stop-seconds, a 5.67 mm height, 21 jewels, 21,600 vibrations per hour, approximately 42 hours of running time, and an accuracy range of -20 to +40 seconds per day. Its product page calls it the company’s “signature standard mechanical movement”; that is Miyota’s description, not an independent rating. See the 8215 specifications.
8205, 8217, and 82S0: choose for the display
Within the standard family, match the model to the dial layout: the 8205 provides day and date, the 8217 adds a 24-hour display, and the 82S0 is a three-hand open-heart option. Miyota’s movement index lists each at 5.67 mm high with an accuracy range of -20 to +40 seconds per day. Other specifications for these models are not included in that index; use the applicable product documentation rather than assuming they match the 8215 in every detail. The index also lists 82S5 and 82S7 for small-second and related open-heart/display configurations. Check the exact hand and dial arrangement before selecting one. See Miyota’s movement index.
Rank #2
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9015: thin case with a date
The 9015 is the relevant premium option in this comparison when a slim movement and date display are both required. Miyota lists it at 3.90 mm high, with an accuracy range of -10 to +30 seconds per day, approximately 42 hours of running time, 28,800 vibrations per hour, and 24 jewels. Its listed functions include automatic and hand winding, quick date setting, and stop-seconds. Miyota describes it as its “signature ultra-thin premium mechanical movement”; this is manufacturer language, not an independent performance assessment. See the 9015 specifications.
9039: thin three-hand design without a date
The 9039 shares the 9015’s listed height, accuracy range, approximate running time, frequency, and jewel count, but its listed function is three hands without a date. That makes the display requirement—not a presumed performance advantage—the key distinction between these two calibers. See the 9039 specifications.
Rank #3
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9075: GMT with an independently adjustable local hour
The 9075 is designed for a GMT display. It has a central GMT hand and an individually adjustable hour hand, so the independently adjusted hand is the local hour hand—not the GMT hand. Miyota lists a 4.92 mm height, -10 to +30 seconds per day accuracy range, approximately 42 hours of running time, 28,800 vibrations per hour, and 24 jewels. The manufacturer calls it a “Mechanical movement equipped with True GMT function.” See the 9075 specifications.
8315: a discontinued long-reserve option
Miyota’s 2024 English catalog lists the 8315 with a 60-hour power reserve, 5.67 mm height, 21 jewels, and 21,600 vibrations per hour. However, Miyota’s current 8315 product page says the product is discontinued. The 2024 catalog says its watch-case construction is compatible with the 8215, 8205, 82S0, 82S5, and 82S7. That case-construction note is not a guarantee that all parts interchange.
Rank #4
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Check fit before buying or servicing
A caliber name or matching height alone is not enough to confirm a replacement. Miyota provides drawings, instruction manuals, parts lists, and exploded views through its product documentation and parts resources. Compare the documentation with the exact watch and the parts being used.
- Identify the required caliber and display. Confirm the existing movement reference if repairing, or select the required date, day/date, subdisplay, open-heart, or GMT layout if building.
- Compare dimensional drawings. Verify the case and movement dimensions, including height; do not infer full compatibility from a single matching measurement.
- Check dial and hands. Confirm the dial attachment and layout and the hand specifications for the exact movement and watch.
- Verify stem and other components. Use the relevant parts list and watch specification to check the stem and any components that must carry over.
- Confirm the source and current status. A manufacturer drawing helps establish dimensions and parts, but it does not authenticate a third-party listing or prove that the listed movement suits your watch.
Miyota’s 8215 page posts a minimum order of 1,000 pieces per model and a production lead time of two months or more. Those are manufacturer order notes, not a statement about consumer marketplace stock; check the live page and supplier for current availability and timing.
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Best Value
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
