Miyota 0S21

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

Two-register version of Miyota's 0S20 quartz chronograph, with no running seconds. Miyota spec sheet (shared with the 0S20): 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 per the spec sheet: 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), date at 6 (Caliber Corner says 4:30 or 6). Caliber Corner lists hacking as "yes", but with no running seconds hand there is nothing to stop, so it is left blank. Miyota does not state a jewel count or country of manufacture; 0 jewels, 32,768 Hz and Japanese manufacture are from Caliber Corner, which also says it replaces the Citizen 0510. Tier "mid" alongside the other quartz chronographs in the database (VK6x, YM62A).

Watches with the Miyota 0S21

Watch	Price from	Movement	Dia. mm	Thick mm	Crystal	Micro-adjust
Addiesdive AD2542	$65	Miyota 0S21	38	12.8	Mineral	no bracelet
Addiesdive AD2549	$72	Miyota 0S21	38	12.8	K1 mineral	no bracelet
Lüm-Tec Combat B64	$545	Miyota 0S21	43	13.6	Sapphire	—

Sources

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