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The Citizen Series 8 / 831 Mechanical Ice Blue Limited Edition, reference NB6051-59L, is a 40 mm automatic watch built around a faceted steel case, integrated-style bracelet and embossed ice-blue dial. Its 100 m water resistance and time-and-date layout suit everyday wear; its defining detail is the geometric dial, paired with a limited production run reported at 1,800 pieces worldwide.
What is the Citizen NB6051-59L?
It is a Series 8 / 831 Mechanical model, the streamlined time-and-date branch of Citizen’s Series 8 range. The watch combines an octagonal, faceted stainless-steel case with a steel bracelet and an ice-blue dial. Brushed and polished surfaces add contrast to the case and H-shaped bracelet links, giving it a sporty look without relying on a bulky case.
The launch report described the dial’s embossed geometric pattern as inspired by sunlight reflecting on clear blue water. Applied faceted markers and hands are luminous, and a date display sits alongside the hours, minutes and central seconds.
Case, dial and bracelet
| Specification | Citizen NB6051-59L |
|---|---|
| Case | Faceted, octagonal stainless steel; 40 mm diameter and 11.6 mm thick |
| Crystal and caseback | Sapphire crystal with anti-reflective coating; transparent caseback |
| Water resistance | 100 m, as stated in the February 2025 launch report |
| Dial and display | Embossed ice-blue geometric dial; luminous applied markers and hands; hours, minutes, seconds and date |
| Bracelet | Steel H-shaped links with brushed and polished finishes; folding clasp with push-button release |
The 40 mm diameter is a useful point of reference, but it does not by itself determine how the watch will fit: wrist shape, the bracelet’s articulation and the distance from lug to lug also matter. The launch report does not state a lug-to-lug measurement. Its transparent back reveals the automatic movement, while the sapphire crystal has an anti-reflective coating.
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- Round watch in silver tone with yellow gold-tone accents featuring blue dial with date window, luminous hands/indices, and chronograph subdials
- 39 mm stainless steel case with mineral dial window
- Japanese quartz movement with analog display
- Stainless steel band featuring fold-over clasp with safety
- Water resistant to 100 m (330 ft): In general, suitable for swimming and snorkeling, but not scuba diving
Calibre 9051: movement and performance figures
The NB6051-59L uses Citizen automatic calibre 9051. The launch report gives 24 jewels, a frequency of 28,800 vibrations per hour, a 42-hour power reserve and a stop-seconds function, which halts the seconds hand when setting the time. Citizen’s stated average accuracy is -10/+20 seconds per day; these are published specifications, not results from an independent test of an individual watch.
A 42-hour reserve means the watch may stop if left unworn beyond that interval, depending on how fully it was wound. The stop-seconds function can help when setting the time precisely, while the date display keeps the layout practical for daily use.
Rank #2
- The "Tsuyosa" Automatic, from the NJ015 series, brings ultramodern sports styling right to your wrist. Executed in a versatile 40mm footprint, the sophisticated design of the watch makes a strong impression via a silver-tone stainless steel case and a seamlessly integrated, matching bracelet.
- . Underneath an anti-reflective sapphire crystal, the sporty timepiece makes use of a sunray green dial, with a 3 o’clock date window and contrasting silver-tone details adding to its classic aesthetic. Powered by an automatic movement and offering up to 50 meters of water resistance, the refined timepiece is a daily wearing choice ready for work, play, and everything in between. Caliber 8210.
- 3 Hand with Date, Automatic, 42 Hour Power Reserve
- Sapphire Crystal
- 50M Water Resistant and 5 Year Limited Warranty
Limited-edition quantity, launch date and price
MONOCHROME Watches’ February 27, 2025 launch report said worldwide production would be limited to 1,800 pieces, with store availability planned for March 2025. The publication reported launch prices of EUR 895 and USD 1,300. Those figures describe the launch announcement, not verified current retail prices. Current authorized-seller stock, regional availability and secondary-market value are not established here; check the seller and market relevant to you before buying.
Quick Recap
Best Value
- The "Tsuyosa" Automatic, from the NJ015 series, brings ultramodern sports styling right to your wrist. Executed in a versatile 40mm footprint, the sophisticated design of the watch makes a strong impression via a silver-tone stainless steel case and a seamlessly integrated, matching bracelet.
- Underneath an anti-reflective sapphire crystal, the sporty timepiece makes use of a sunray blue dial, with a 3 o’clock date window and contrasting silver-tone details adding to its classic aesthetic. Powered by an automatic movement and offering up to 50 meters of water resistance, the refined timepiece is a daily wearing choice ready for work, play, and everything in between. Caliber 8210.
- 3 Hand with Date, Automatic, 42 Hour Power Reserve
- Sapphire Crystal
- 50M Water Resistant and 5 Year Limited Warranty
Rank #4
- Men's luxury timepieces with technical advancements and a sporty style
- 1 Second Chronograph Measures up to 60 Minutes, 12/24 Hour Time, Date
- Silver-Tone Stainless Steel Case
- Mineral Crystal
- 100 Meters Water Resistant and 5 Year Limited Warranty
Rank #3
- Men's luxury timepieces with technical advancements and a sporty style
- 1/5 Second Chronograph Measures up to 60 Minutes, 12/24 Hour Time, Date
- Silver-Tone Stainless Steel
- Spherical Mineral Crystal
- 100 Meters Water Resistant and 5 Year Limited Warranty
Who the Ice Blue Limited Edition may suit
- For everyday versatility: the time-and-date display, steel construction and reported 100 m water resistance make it an easy-to-understand daily-wear proposition. Water resistance is a rating, not a guarantee of suitability for every water activity; follow Citizen’s care guidance for the specific watch.
- For a distinctive dial: the embossed geometric pattern and pale blue color give the watch more visual presence than a plain, flat dial.
- For a compact sporty profile: the 40 mm case diameter and 11.6 mm thickness provide concrete sizing figures, though fit depends on the wearer’s wrist and the watch’s full geometry.
- For a limited-run model: the reported 1,800-piece production quantity may appeal to collectors, but limited production alone does not establish future resale value or current availability.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
