Miyota 0S20

Citizen (Miyota) · Quartz · Mid tier · Family: Miyota 0S2x chronograph

Miyota's standard three-register quartz chronograph (an all-electronic quartz chronograph, not a meca-quartz like Seiko's VK6x, although some watch brands call it one). Miyota spec sheet (shared with the 0S21): 13½ lignes, Ø30.8mm, 5.10mm high, accuracy ±20 s/month, SR927W battery, battery life 5 years assuming 60 minutes of chronograph use per day; pulling out the stem minimises consumption; shock detection. Layout: central hours, minutes and 1/1-second chronograph hand (timing up to 59 min 59 s), 60-minute chronograph counter at 9, 24-hour hand at 3 (set with the hour hand; Miyota's manual has no separate setting), small seconds at 6, date at 4:30 (Miyota's calendar variations list the window at 4:30 or 6). The manual says the small seconds hand starts again when the crown is pushed back in from the time-setting position (recorded as hacking). Miyota does not state a jewel count or country of manufacture; 0 jewels, 32,768 Hz and Japanese manufacture are from Caliber Corner. Tier "mid" alongside the other quartz chronographs in the database (VK6x, YM62A). The 0S21 is the two-register version without small seconds.

Watches with the Miyota 0S20

Watch	Price from	Movement	Dia. mm	Thick mm	Crystal	Micro-adjust
Addiesdive AD2543	$72	Miyota 0S20	37	12.7	K1 mineral	—
Addiesdive AD2551	$78	Miyota 0S20	37	12.7	K1 mineral	—
Addiesdive AD2552	$79	Miyota 0S20	37	12.7	K1 mineral	—
Lüm-Tec RPM 3	$495	Miyota 0S20	43	12.3	Sapphire	—

Sources

• Miyota, Cal. 0S20 Chronograph (official spec page)
• Miyota, Cal. 0S20/0S21 spec sheet
• Miyota, Cal. 0S20 instruction manual
• Caliber Corner, Miyota caliber 0S20