Citizen Atessa's wish is for you to spend time with your loved ones.BY1000-51Lhas appeared.
This is a limited pair model from the "DEAR Collection" that expresses the light shining through stained glass in the silence of winter.
Limited to 2,200 pieces worldwide, this is a romantic radio-controlled solar watch equipped with the "Luna Program" automatic moon phase calculation function.
The Duratect platinum case and band create a solemn and sacred impression, and the vertical blue gradation expresses the light falling on a church. The moon phase is made of translucent white pearl shell, allowing you to enjoy the waxing and waning of the moon as if looking up at the night sky through stained glass.
A limited edition model with a beautiful blue gradation.
A design that expresses the light of stained glass.
The moon phase of the white pearl oyster is fantastic.
The brilliance of Duratect Platinum.
■ Main features
- DEAR Collection:A pair model who spends time with their loved ones.
- Limited to 2,200 pieces worldwide:A rare limited edition model.
- Moon phase function:Equipped with Lunar Program, an automatic moon age calculation function.
- White pearl dial:A beautiful design that expresses stained glass.
- Blue gradation:Reproduce the light falling on the church.
- Photovoltaic eco-drive:No need for regular battery replacement.
- Radio clock:Compatible with 4 areas: Japan, China, America and Europe.
- Direct flight:Display world time in 2 steps.
- Super titanium:Light, scratch resistant, and rust resistant.
- Duratect Platinum:Beautiful light silver shine.
- Perfect:Anti-magnetic, shock detection, automatic needle correction.
- Perpetual calendar:No date adjustment required.
- 10 ATM waterproof:Reinforced waterproof for daily life.
- Nickel allergy resistance:Skin-friendly material.
- Fit adjuster:Easy size adjustment.
- Luminous function:Luminous paint on the hands and indexes.
- Made in Japan:High quality made in Japan.
■Specs
| brand | CITIZEN |
|---|---|
| series | ATTESA |
| Product number | BY1000-51L |
| Drive method | Photovoltaic Eco-Drive radio wave (Caliber H874-08Z) |
| precision | Average monthly difference ±15 seconds (when not receiving) |
| Driving period | Operates for approximately 2.5 years when fully charged (when power save is activated) |
| Radio wave reception | China/US/Europe radio wave reception |
| case | Super Titanium (Duratect Platinum/Light Silver Color) |
| band | Super titanium (Duratect platinum/light silver color) (split pipe type) |
| glass | Sapphire glass (non-reflective coating) |
| Dial color | Blue (some white pearl dial) |
| belt color | silver |
| case size | Approximately 50 x 43 x 11mm |
| Belt width (maximum) | Approximately 21mm |
| weight | Approximately 80g |
| belt around arm | Maximum approximately 18.5cm |
| waterproof | Reinforced waterproof for daily life (10 atm) |
| Other functions | Day & date display / 24 hour display / Moon phase display / Moon phase automatic calculation function / Northern/Southern hemisphere moon phase display switching function / Perpetual calendar / Receiving station automatic selection function / Scheduled reception function / Forced reception function / World time function (24 hour difference) / Summer time function / Shock detection function / Automatic needle correction function / Charge amount display function / Charging warning function / Overcharge prevention function / Power save function / Nickel resistant / Magnetic resistant type 1 / Luminous (hands + index) / Partial white pearl dial / Dial parts: Recycled material / Fit adjuster / City display engraved on the back cover |
| accessories | Warranty card/special box (instruction manual is electronic) |
| Release date | November 2025 |
| price | Manufacturer's suggested retail price: 170,500 yen (tax included) |
| limited quantity | Limited to 2,200 pieces worldwide |
| Guarantee | Five-year warranty from the manufacturer (Registration to MY CITIZEN required) *Nanapure is currently running a 7-year warranty campaign. |
■ DEAR Collection - Spend time with your loved ones
BY1000-51L is a pair model from the "DEAR Collection" with the hope that you can spend time with your loved ones. The theme for 2025 is light shining through stained glass in the silence of winter. It depicts two people vowing their love to each other in a sacred church, surrounded by beautiful light.
The rarity of only 2,200 pieces worldwide makes this special piece even more valuable. This model is perfect as a pair watch with a loved one, or as an anniversary gift.
■ Blue gradation that expresses the light of stained glass
The dial is a vertical blue gradation depicting the various lights falling on the church. The elegant design, which combines Roman numerals and bar indexes, creates a solemn and sacred atmosphere.
The dial, which is partially made of white pearl oyster, changes its appearance depending on the angle of the light, emitting a beautiful shine. It has a fantastic design, with the light of stained glass reflecting on the dial.
■ The moon phase of the white lipped oyster is beautiful.
It features a moon phase function equipped with the automatic moon phase calculation function "Luna Program". The area covering the moon plate is made of white pearl oyster with translucent printing, creating a beautifully glowing stained glass look.
You can check the waxing and waning of the moon tonight just like looking up at the night sky through stained glass. It is also equipped with a function to switch the moon phase display between the northern and southern hemispheres, allowing accurate moon phase display anywhere in the world.
■ The majestic brilliance of Duratect Platinum
The case and band are made of super titanium coated with Duratect Platinum (light silver color). It has a more beautiful and luxurious shine than regular titanium. The design creates a solemn and sacred impression and is suitable for the scene of vowing love in a church.
■ Excellent properties of super titanium
Citizen's proprietary material ``Super Titanium'' combines three properties: light, scratch resistant, and rust resistant. Approximately 40% lighter than stainless steel and has a surface hardness more than 5 times. The lightweight design weighs approximately 80g, so you won't get tired even if you wear it for a long time.
It is nickel allergy resistant, so even people with metal allergies can use it with confidence. The material is gentle on the skin and comfortable to wear every day.
■ No need to replace batteries with photovoltaic eco-drive
Equipped with Citizen's proprietary photovoltaic technology "Eco-Drive." The clock continues to run by converting sunlight and small amounts of indoor light into electricity. Once fully charged, it will run for about 2.5 years when power save is activated, so there is no need to regularly replace the battery.
It has been certified as an environmentally friendly Eco Mark product, demonstrating consideration for the global environment.
■ Radio clock compatible with four areas: Japan, China, America and Europe
It receives standard radio waves from four areas around the world: Japan, China, America, and Europe, and automatically adjusts the time and calendar. Equipped with automatic receiving station selection function, scheduled reception function, and forced reception function, it keeps accurate time at all times.
■ Easy access to overseas time with direct flight
The "Direct Flight" function allows you to display the time around the world in two easy steps. The world time function supports 24-hour differences and also includes a summer time function. When traveling overseas, you can quickly switch to the local time.
■Perfex is strong against magnetism and shock
Equipped with the original technology "Perfex" that integrates three functions: "JIS Class 1 magnetic resistance", "shock detection function" and "automatic needle correction function". Prevents the hands from shifting due to magnetism or shock, and always displays accurate time.
It is unaffected by the magnetic fields we come into contact with in our daily lives, such as smartphones and computers, and automatically adjusts the hands when it detects an impact.
■ No need to adjust date with perpetual calendar
The perpetual calendar function automatically detects leap years, eliminating the hassle of adjusting the date. The day and date display allows you to check the day of the week and date at the same time, and it also has a 24-hour display.
■ Peace of mind with charge amount display function
The charging amount display function allows you to check the current charging status at a glance. Equipped with charging warning function, overcharging prevention function, and power save function, it realizes efficient energy management.
■ Sapphire glass is scratch resistant
The windshield uses sapphire glass with anti-reflective coating. It combines high transparency and scratch-resistant hardness. It suppresses light reflection and achieves excellent visibility, making the dial easy to see from any angle.
■ 10 ATM water resistant, safe for daily use
Reinforced waterproofing for daily life (10 atm) allows you to use it with confidence not only when washing your hands or in the rain, but also when working with water or doing marine sports. It is useful in a wide range of situations, from business to casual to outdoor activities.
■ Easy size adjustment with fit adjuster
Equipped with a fit adjuster on the clasp, allowing for easy size adjustment without tools. It's convenient because you can quickly respond to changes in your arm circumference due to the season or your physical condition.
■ Luminous function makes it easy to see even in dark places
Luminous paint is used for the hands and indexes, making it easy to check the time even in dark places. This is a practical feature with excellent night visibility.
■ Use of environmentally friendly recycled materials
Recycled materials are used for the dial parts, giving consideration to environmental issues. The city display is engraved on the back cover, making it easier to use the world time function.
■ High quality made in Japan
High quality watches made in Japan. The watchmaking technology that Citizen has cultivated over many years is condensed into this one piece. Please feel the world-class Japanese technology on your wrist.
■ Recommended for these people
- Those looking for a pair watch with a loved one
- Those who want to collect limited edition models
- Those who are attracted to the moon phase function
- Those seeking the convenience of a radio-controlled solar watch
- Those who want a lightweight and comfortable watch
- Those looking for a scratch-resistant watch
- Businessman who frequently travels and does overseas business trips
- Those who like elegant design
- Those looking for an environmentally friendly watch
- Citizen Atessa fan
- Those looking for high quality watches made in Japan
- Those looking for a special anniversary gift
■ Buyer's comment
When I first saw BY1000-51L, I was breathless at the beauty of the blue gradation. The dial, which expresses the light of stained glass, changes its expression every time you change the angle, making it truly magical. The moon phase of the white pearl oyster reminds you of the night sky over a church, giving you a romantic feeling. Super Titanium's light weight of approximately 80g is surprising, and it is extremely comfortable to wear. The combination of eco-drive and radio clock is perfect for practicality. The rarity of this watch, which is limited to 2,200 pieces worldwide, is also attractive, and I think it's the perfect watch to pair with your loved one. by Fujimuro
■ Purchase at each mall
■ Related model (Citizen Atessa)
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