Citizen Exceed Moon Phase “Mid-Autumn Moon” BY1025-17E JDM Limited Edition | Radio-Controlled Solar Watch in Super Titanium with Duratect Amber Yellow Finish, Automatic Moon Phase, Mother-of-Pearl Dial with Sapphire Clarity Coating (41 mm, 100 m)

Professional Description

The Citizen Exceed “Mid-Autumn Moon” BY1025-17E is a masterpiece of both technical and artistic watchmaking, reserved exclusively for the Japanese Domestic Market (JDM) as part of the prestigious Exceed collection—the manufacturer’s most refined dress watch line alongside The Citizen series. Inspired by the ancient Japanese celebration of Chūshū no Meigetsu (中秋の名月, the contemplation of the autumn full moon or harvest moon), this watch commemorates the mystique of the moon suspended in the night sky through an exquisite dial crafted from authentic black mother-of-pearl (Black Mother of Pearl), whose dark iridescent hues evoke a clear night sky.

The case is crafted from Super Titanium™, Citizen’s proprietary aerospace-grade titanium treated with a special Duratect Amber Yellow coating: a warm hue between classic gold and amber that emulates the golden glow of the autumn moon, while also making the steel five times more scratch-resistant. Inside beats the advanced H874 Eco-Drive Radio-Controlled in-house caliber, equipped with the sophisticated Luna Program for automatic astronomical calculations. Protected by a sapphire crystal with Clarity Coating (99% light transmission) and paired with a genuine alligator leather strap, it represents a sublime fusion of visual poetry, titanic lightness, and atomic precision.

Key Features

• JDM “Mid-Autumn Moon” Limited Edition: A strictly limited commemorative production run for the Japanese market, highly coveted internationally by collectors of high-end conceptual timepieces.
• Moon Phase Complication with “Luna Program”: Unlike traditional mechanical moon phases that require periodic adjustments, the H874 caliber autonomously calculates the exact age and phase of the moon based on time and calendar signals received via radio frequency.
• Super Titanium™ with Duratect Amber Yellow Treatment: A solid titanium case treated with Citizen’s patented surface-hardening technology in an exclusive amber-gold hue. It is 40% lighter than steel, completely hypoallergenic, and exceptionally resistant to everyday wear and tear.
• Black Natural Mother-of-Pearl Dial (Black Mother of Pearl): A surface made from selected organic seashell material that interacts with ambient light to reveal iridescent flashes of green, violet, and graphite, making each watch a one-of-a-kind work of art.
• Sapphire Crystal with Clarity Coating: A proprietary multi-layer anti-reflective treatment applied to both sides of the crystal that eliminates 99% of reflections, creating the illusion that there is no barrier between the eye and the dial.
• Genuine Crocodile Leather Strap (Genuine Crocodile): A high-quality leather strap crafted from black-scaled crocodile leather, paired with a folding clasp with pushers that prevents premature wear of the leather.
• Multi-Band Radio-Controlled Synchronization: Automatic daily reception of time signals transmitted by atomic reference stations to maintain accuracy to the fraction of a second without the need for manual intervention.
• Water Resistance to 100 Meters (10 ATM): Water resistance exceeding standard specifications for formal and dress watches, allowing for safe use in situations involving accidental contact with water or heavy rain.

Technical Specifications

Component / Feature Technical Detail
Brand and Collection Citizen Exceed (Mid-Autumn Moon Commemorative Edition)
Reference / Model BY1025-17E (JDM Limited Edition)
Origin and Manufacture Entirely manufactured in Japan (Made in Japan)
Movement Type Eco-Drive Solar Radio-Controlled Quartz (Manufacture Caliber H874)
Power Source Continuous light charging (extended battery life with power-saving function)
Case Material Super Titanium™ with Duratect Amber Yellow surface coating
Case Dimensions Diameter: 41.0 mm | Thickness: 11.9 mm
Crystal Sapphire crystal with Clarity Coating (double-sided anti-reflective coating)
Dial Natural black mother-of-pearl with moon phase window
Strap Genuine crocodile leather in black
Closure Titanium trifold clasp with side release pushers
Water Resistance 100 meters (10 ATM / 10 Bar)
Magnetic Protection Anti-magnetic resistance (in accordance with JIS Class 1 standards)
Case Back: Solid with commemorative limited-edition engraving

Astronomical Complications and Technical Performance

• Lunar Phase Graphic Disc: A window located in the upper half of the dial that graphically illustrates the continuous transition between New Moon, First Quarter, Full Moon, and Last Quarter.
• Integrated Perpetual Calendar: Day-of-the-week and numeric date display automatically synchronized through February 28, 2100, accounting for leap years and months of varying lengths.
• World Time and Quick-Set Function: World time display for major capitals and international time zones with quick adjustment via the electronic crown.
• Power Reserve Indicator: Instant check of the power reserve level to plan preventive lighting displays.
• Faceted Luminescent Hands: Clean-cut gold hands equipped with high-brightness phosphorescent material to allow for clear reading in low light without compromising the visual purity of the dial.