Miyota 8315
Factory specs
- Caliber
- 8315
- Made in
- Japan
- Frequency
- 21,600 bph (3 Hz)
- Power reserve
- 60 h
- Jewels
- 21
- Hacking
- Yes
- Hand winding
- Yes
- Accuracy
- -20 / +40 s/day
- Diameter
- 26 mm
- Height
- 5.67 mm
- Functions
- Hours, Minutes, Seconds, Date
- Same family
- Miyota 8205, Miyota 8215, Miyota 8217, Miyota 821A, Miyota 8285, Miyota 82S0, Miyota 82S5, Miyota 82S7, Miyota 8N24, Miyota 8N33
Long-power-reserve member of Miyota's 82 series (Miyota calls it its longest-running mechanical movement); factory sheet: 11 1/2 ligne, 5.67mm high, 26.00mm, 21 jewels, 21,600 vph, about 60 hours, -20 to +40 s/day, posture difference under 50 s, lift angle 49 degrees, gilt version available. The factory instruction sheet says the seconds hand restarts when the crown is pushed back in (stop-second) and that a full wind takes 51 crown turns. Miyota's product page marked the caliber "discontinued" when checked on 2026-10-20. Tier "entry" per the guide's Miyota 82xx row.
Watches with the Miyota 8315
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 San Martin SN029 41mm (Miyota 8315) |
$259 | Miyota 8315 | 41 | 13.5 | Sapphire | — |
 San Martin SN012 40mm (Miyota 8315) |
$278 | Miyota 8315 | 40 | 12.5 | Sapphire | — |
 San Martin SN036 41.5mm (Miyota 8315) |
$278 | Miyota 8315 | 41.5 | 13.7 | Sapphire | — |
 San Martin SN049 43mm (Miyota 8315) |
$278 | Miyota 8315 | 43 | 13.5 | Sapphire | no bracelet |
 Baltic HMS 002 |
$432 | Miyota 8315 | 38 | 13 | Acrylic | On-the-fly |
 Wise Diving 300M Gen 3 Titanium |
$610 | Miyota 8315 | 44 | 15.8 | Sapphire | no bracelet |
 Nodus Deep |
$650 | Miyota 8315 | 42 | 13.6 | Sapphire | On-the-fly |