Miyota 6S21
Factory specs
- Caliber
- 6S21
- Made in
- Japan
- Jewels
- 0
- Accuracy
- -20 / +20 s/month
- Battery life
- 3 years
- Diameter
- —
- Height
- 4.9 mm
- Functions
- Hours, Minutes, Small seconds, Date, Chronograph
Quartz chronograph from Miyota's 6S family (6S10, 6S11, 6S20, 6S30). Caliber Corner lists: 15 lignes, 4.9mm high, 9.85mm minimum case thickness, 0 jewels, 32,768 Hz, SR927W battery, battery life about 3 years, accuracy ±20 s/month (Miyota's figure), five hands: central hours and minutes, central chronograph seconds hand (four steps per second), small seconds at 3, 60-minute chronograph counter at 9 and a date at 4:30 (position varies by watch). The chronograph hands reset through a heart cam and can be realigned with the pushers. Caliber Corner also gives a 34.6mm diameter, which doesn't match 15 lignes (33.8mm), so no diameter is recorded until Miyota's spec sheet can be checked: Miyota's own product page and PDFs (miyotamovement.com/product/6S21/) were down for maintenance on 2026-10-24. Hacking is not stated. Tier "mid" alongside the other quartz chronographs in the database (Miyota 0S2x, Seiko VK6x).
Watches with the Miyota 6S21
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 Militado ML23 |
$139 | Miyota 6S21 | 40 | 12.7 | Sapphire | no bracelet |
 Geckota Chronotimer Chronograph |
$532 | Miyota 6S21 | 42 | 13 | Sapphire | no bracelet |