Introduction
The integrated-bracelet sports watch segment has been dominated by the usual suspects: Royal Oak, Nautilus, and their myriad homages. But in 2021, Citizen quietly dropped a bomb with the Series 8 collection, and the 831 reference (NB6051-59L) is the blue-dialed star that deserves your attention. It’s not a clone; it’s a genuine original with a Japanese design philosophy that feels both retro-futuristic and street-ready.
At $1,295 retail, the Series 8 831 offers an in-house automatic movement, 100m water resistance, and a case that looks like it was carved from a single block of steel. The blue dial is a gradient masterpiece, shifting from deep navy to almost black depending on the light. This is a watch for the young collector who wants something distinctive without playing the AD game or paying grey-market premiums.
In this review, we’ll break down the history, movement, specs, wrist feel, and investment potential of the Citizen NB6051-59L. Whether you’re a first-time luxury buyer or a seasoned collector looking for a daily beater with style, this watch might be your next obsession.
Manufacture History
Citizen Watch Co. began in Tokyo in 1918 as the Shokosha Watch Research Institute and became Citizen in 1930. Known for democratizing precision, Citizen introduced the world’s first quartz watch in 1973 and later the Eco-Drive series. The Series 831 line, launched in 2021, revives the brand’s 1970s integrated-bracelet aesthetic with modern in-house automatics, targeting the enthusiast who values originality over hype.
Movement
The Caliber 9051 is a workhorse automatic movement with 24 jewels, 28,800 vph, and a 42-hour power reserve. It features a decorated rotor visible through the display caseback. While not COSC-certified, it runs reliably within +5 to +10 seconds per day. Citizen manufactures the movement in-house, ensuring quality control and parts availability.
Specifications
- Case Diameter: 40mm
- Case Thickness: 12.5mm
- Lug-to-Lug: 48mm
- Case Material: Stainless steel
- Crystal: Sapphire
- Water Resistance: 100m
- Lume: Super-LumiNova
- Bracelet/Strap: Stainless steel bracelet with folding clasp
Wrist Feel
The 40mm case wears surprisingly compact thanks to the integrated lugs and 48mm lug-to-lug. On a 6.75-inch wrist, it sits flat and doesn’t overhang. The bracelet is fully articulated with a micro-adjust clasp, though the lack of on-the-fly adjustment is a minor gripe. At roughly 150g, it’s substantial but not heavy—perfect for all-day wear.
The case finishing is a highlight: alternating brushed and polished facets catch light like a much more expensive watch. The crown is signed and easy to grip. The display caseback shows the 9051 movement with a modest rotor decoration—nothing haute horlogerie, but clean and honest.
Accuracy
In real-world testing, the Cal. 9051 runs within +5 to +10 seconds per day, which is excellent for a non-COSC movement. After a week of mixed wear, expect around +7 s/d. It’s not a precision instrument like a Grand Seiko, but for the price, it’s more than acceptable. The movement is also easy to regulate if you’re picky.
Occasions
The Series 8 831 is a true GADA (go-anywhere, do-anything) watch. It works with a suit, jeans, or swim trunks. The 100m water resistance and screw-down crown make it pool-safe, while the blue dial dresses up nicely for evening events.
Wrist Presence
4/5 – The blue dial and faceted case catch eyes without screaming for attention. It’s a conversation starter for those in the know, but subtle enough for the office.
Reference Variants
- NB6050-59L – Black gradient dial, same case and movement.
- NB6052-59L – Green gradient dial, limited to certain markets.
- NB6054-59L – Silver sunburst dial, more traditional look.
Family References
The Series 8 collection also includes the NB6050, NB6052, and NB6054, all sharing the same case and movement with different dial colors.
Other Notable Citizen Models
- Citizen Promaster Diver (NY0040) – Iconic automatic diver.
- Citizen Eco-Drive Satellite Wave (CC3085) – GPS-synced solar.
- Citizen Chronomaster (AQ4020) – High-accuracy quartz with perpetual calendar.
Similar Watches
- Tissot PRX Powermatic 80 – Similar integrated-bracelet design at a lower price point, but with a less refined movement.
- Seiko Presage Sharp Edged Series (SPB167) – Japanese automatic with a striking dial and similar price, but not integrated bracelet.
- Longines HydroConquest (L3.782.4) – Sporty 41mm diver with sapphire crystal and automatic movement, but more traditional lugs.
Homages
- Pagani Design PD-1701 – A cheap homage to the integrated-bracelet look, but with quartz movement and lower build quality. Priced around $80.
Investment Value
MSRP is $1,295, and pre-owned examples range from $800 to $1,100. The trend is stable; this is not a watch that will skyrocket in value, but it holds its own. Buy it to wear and enjoy, not as a speculative asset. No major auction history.
Service Interval
Citizen recommends service every 5 years. Cost is approximately $250 at an independent watchmaker. Parts are readily available, and the movement is easy to work on.
Price Range
$1,295 retail. For a trust-fund-baby buyer, this is a smart, understated choice that won’t scream “look at me” but will earn respect from those who know watches.
Pros and Cons
Pros
- In-house automatic movement
- Stunning blue gradient dial
- 100m water resistance with screw-down crown
- Excellent case finishing for the price
Cons
- No on-the-fly micro-adjust clasp
- Power reserve could be longer (42h)
- Bracelet lacks taper
- Not COSC-certified
Final Verdict
The Citizen Series 8 831 (NB6051-59L) is a compelling alternative to the Swiss integrated-bracelet establishment. It offers genuine in-house manufacturing, a dial that rivals watches three times its price, and a comfortable, versatile wear. If you want a modern classic without the hype tax, this is it.
