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Citizen NK0051-51B Watch
The Citizen NK0051-51B is an automatic watch from the KEI series, the line with which Citizen returns to the essentials: watches of clean balance, with no superfluous elements, made to last longer than a trend. It defines itself as a watch that adapts to the wrist and the occasion without imposing a style.
The case is steel, measuring 38 mm in diameter and 11 mm thick, and weighs 134 g. The 38 mm is a measurement Citizen has chosen on purpose at a time when the market is returning to contained sizes. The distance between lugs has been shortened so that the watch sits well on the wrist and does not wobble. The fitted bracelet is solid steel, not integrated, and closes with a push-button deployment clasp.
The dial is silver-white, with luminous hands and indices, and includes a date window at 3 o'clock. Legibility has been worked to the millimetre: the minute and second hands reach right to the scale, and the hour hand stays close to the indices, so the time reads effortlessly. The fitted crystal is flat sapphire. The case back is transparent and screw-down, allowing the rotor and the mechanism to be seen in operation. Water resistance is 5 bar.
The movement is the 8310 calibre, automatic, with an average daily accuracy of -20 to +40 seconds, the same as the latest in the Tsuyosa and Promaster lines. The crown is pull-type, without screw threads, and is located at 3 o'clock. Compared to the Tsuyosa, the crown location changes, not its function: it also has hacking seconds for precise setting.
The KEI series is not a Tsuyosa nor a pilot watch: it is a dress automatic with a contained case, designed to accompany for years. Citizen describes it as a piece without adornments, focused on what is truly asked of a watch: that it reads well and is comfortable. The NK0051-51B is the silver-white dial variant, which sums all of that up perfectly but within a series that also offers grey, blue, black, green and silver with gold details. Defining it as a versatile watch, designed to stay on the wrist when fashions change.
Automatic Calibre 8310 60-Hour Power Reserve Flat Sapphire White Dial
Why choose this watch?
60-hour power reserve
In this watch the incorporated calibre is the 8310 and offers 60 hours of running time, compared to the 40 hours of entry-level automatics. Almost a full day of additional charge compared to other models.
38 mm and 11 mm: contained case, short lugs
Citizen shortened the distance between lugs so that the 38 mm case sits well on medium wrists without protruding. The 11 mm thickness and 134 g keep it flat under a sleeve. It is not a watch of presence, it is a watch of proportion.
Legibility of hands extended to the scale
The minute and second hands reach exactly to the scale, and the hour hand sits close to the indices. It is a solution that prioritises clear reading over adornment. The result is a dial that reads effortlessly.
Neutral style: neither sporty nor classic
KEI was born to fill the gap between sporty and classic designs. The NK0051-51B is a neutral-style watch, designed to adapt to any occasion without imposing a code. Those looking for a diver or a dress watch with adornments should choose another model, not this watch.
Frequently asked questions
Can the bracelet of the NK0051-51B be changed for a strap?
Yes. The bracelet of this watch is mounted on lug-to-lug spring bars, it is not an integrated bracelet. It can be replaced with a strap of the same width between lugs.
Can it be wetted or does it only resist splashes?
The case resistance is 5 bar. It covers splashes, rain and hand washing, but not swimming or showering with the watch on. For aquatic use, a watch with greater resistance is advisable.
Is the transparent screw-down case back more fragile than a solid case back?
It is a screw-down case back with crystal, water resistant to 5 bar. It is not more fragile than a solid case back in normal use, but knocks on the case back should be avoided. The case back crystal of this model reveals the rotor of the 8310 calibre.
Does the 38 mm case fit well on large wrists?
Citizen shortened the distance between lugs on purpose so that the case does not protrude. It is a compact watch, designed for medium wrists. Perhaps on large wrists this watch may feel small, depending on the intended use concept of the watch.
