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Citizen KEI NK0055-51Q Watch
The Citizen KEI NK0055-51Q is an automatic from the KEI series, the line with which Citizen returns to essentials: watches of clean balance, with nothing superfluous, made to outlast a trend. KEI began as a project for the Japanese market. The brand already had sports models (Promaster), mechanical pieces with character (Series 8) and recognisable classics (Tsuyosa), but it lacked a neutral piece that was neither one nor the other. That is where KEI came from: a watch that adapts to the wrist and to the occasion without imposing a style.
The case is steel, 38 mm in diameter and 10.9 mm thick. The 38 mm is a size Citizen chose on purpose at a time when the market is returning to contained dimensions. The distance between the lugs has been shortened so that the watch sits well on the wrist and does not shift. The fitted bracelet is solid steel, not integrated, and closes with a deployant triple-folding clasp with pushers. The crystal is sapphire with anti-reflective treatment, and the case back is transparent and screwed down, allowing the rotor and the movement to be seen in operation. Water resistance is 5 bar.
The movement is the 8310 calibre, automatic, the same as the latest Tsuyosa and Promaster models. It offers 60 hours of power reserve, 21,600 oscillations per hour, 21 jewels, hacking seconds and manual winding. The dial includes a date window at 3. The crown is pull-type, not screw-down, and is located at 3. Compared with the Tsuyosa, the position of the crown changes, not its function: it also has hacking seconds for precise setting.
Legibility has been worked on to the millimetre: the minute and seconds hands reach exactly to the scale, and the hour hand stays close to the indices, so the time can be read without effort, even in poor light. The indices and hands carry luminous material. The date window at 3 adds a practical function without breaking the symmetry of the dial.
The KEI series is not a Tsuyosa and not a pilot's watch: it is a dress automatic with a contained case, designed to accompany for years. Citizen describes it as a piece without adornment, focused on what is truly asked of a watch: that it reads well and feels comfortable. The NK0055-51Q is the silver dial variant with gold details within a series that also offers silver-white, black, grey, blue and green.
The gold on this dial is not an integral finish: it appears only on the bezel, the indices and the hands. That detail is what sets this variant apart from the rest of the KEI series. The steel of the case and bracelet is still there, the see-through back is still there, but the gold marks the reading points and draws attention to the time. It is not a gold that invades the watch: it is an accent reserved for what is looked at.
Automatic 8310 Calibre 60-Hour Power Reserve 38 mm Silver Dial Gold Details Date Sapphire See-Through Back
Why choose this watch?
60-hour power reserve
The 8310 calibre offers 60 hours of running time, compared with the 40 hours of entry-level automatics. It is taken off on Friday night and is still running on Monday morning. It is the difference between an automatic that has to be reset and one that waits.
38 mm and 10.9 mm: contained case, short lugs
Citizen shortened the distance between the lugs so that the 38 mm case sits well on medium wrists without overhanging. The 10.9 mm thickness keeps it flat under a sleeve. It is not a watch of presence, it is a watch of proportion.
Silver dial with gold details: the accent on the reading points
The gold does not invade the watch: it appears only on the bezel, the indices and the hands. It is an accent that draws attention to the time without breaking the harmony of the steel. The silver dial does the rest: it reads clearly and maintains the neutral character of the series.
Sapphire and see-through back on an entry-level automatic
The sapphire crystal with anti-reflective treatment and the see-through crystal case back are not common at this price point. The sapphire protects the dial and the see-through back reveals the rotor of the 8310 calibre. It is the visible part of the mechanics.
Frequently asked questions
Is the gold on the bezel, indices and hands a gold plating?
It is not an integral gold plating. It is a gold finish applied over steel on the bezel, the indices and the hands. The rest of the case and bracelet are steel. It is a decorative detail that does not alter the properties of the steel or the resistance of the watch.
Can the bracelet be replaced with a strap?
Yes. The bracelet is mounted on spring bars, not an integrated bracelet. It can be replaced with a 19 mm lug width strap. The only particularity is that the original clasp is a deployant triple-folding clasp with pushers, so a new strap will need its own clasp or a buckle.
Can it get wet, or does it only resist splashes?
Water 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 higher resistance is advisable.
Does the 38 mm case work well on large wrists?
Citizen shortened the distance between the lugs on purpose so that the case does not overhang. It is a compact watch, designed for medium wrists. On large wrists it may sit tight, but the short lugs help it not to look small.
