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Movement · Citizen · automatic

Citizen 9051 movement

Citizen 9051 is an automatic movement by Citizen: 241 jewels, beating at 28,800 bph1, 42 h1 of power reserve.

Sources checked · How we source numbers

Citizen 9051 at a glance

Jewels
241
Beat rate
28,800 bph1
Power reserve
42 h1
Accuracy
−10 to +20 s/day1
Do not set the date
20:30–02:001

New to the terms? Read quartz vs automatic or watch movement types.

Setting and servicing the Citizen 9051

The figures a watchmaker or a timegrapher needs for the Citizen 9051, as Citizen prints them.

Accuracy (maker)
−10 to +20 s/day1
Power reserve
42 h1
Do not set the date
20:30–02:001

All Citizen 9051 figures

Every figure we hold for the Citizen 9051, with its source. Where sources disagree, each value is shown.

Running

Type as printed
Automatic mechanical watch1
Jewels
241
Beat rate
28,800 bph1
Power reserve
42 h1
Hands and functions
hours, minutes, centre seconds, date1

Accuracy and care

Accuracy (maker)
−10 to +20 s/day1
Do not set the date
20:30–02:001

Not published yet

  • Diameter: not published by Citizen
  • Height: not published by Citizen
  • Lift angle: not published
  • Hacking seconds: not published
  • Hand holes: not published
  • Dial feet: not published
  • Stem part number: not published

Citizen 9051 questions

How accurate is the Citizen 9051?

Citizen rates the Citizen 9051 at −10 to +20 s/day, measured under Citizen’s own test conditions; a worn Citizen 9051 can run outside the −10 to +20 s/day range.

Source [1]

How long does the Citizen 9051 run when fully wound?

About 42 h from a full wind, per Citizen.

Source [1]

When should you not change the date on the Citizen 9051?

Not between 20:30 and 02:00, per Citizen: the Citizen 9051’s date change is engaged then, so move its hands past 02:00 before using the quick-set.

Source [1]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Citizen Watch Co. — Instruction manual, Cal. 9051 · pdf · read