Casio’s BABY-G＋PLUS BGA-20K is one watch series in three color variants, with a small windowed face graphic that changes when the date changes. The Japanese listing names the BGA-20K-1AJR, BGA-20K-4AJR, and BGA-20K-7AJR; each is listed for ¥12,100 including tax, with an October 2026 release month. The watch can also be removed from its resin band and displayed in the included holder as a bag charm or desk decoration.
How does the BGA-20K’s face change?
The BGA-20K is an analog, three-hand watch, not a digital display or an app-controlled watch face. Two small windows in its dial show parts of a playful face graphic. A rotating disc behind the windows changes the visible eye shapes as the date changes, so the expression shifts daily.
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Casio’s official Japanese product page describes it this way: 「小窓から見える表情は、日付変更とともに毎日変わります。」 Translation: “The expression visible through the small windows changes every day along with the date.”
What are the three BGA-20K models?
Casio Japan’s product index lists three model numbers in the BABY-G＋PLUS BGA-20K series. They are color/model alternatives; the cited listings do not identify different feature tiers.
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- ●Fully automatic calendar
| Model | Listed price in Japan | Release timing |
|---|---|---|
| BGA-20K-1AJR | ¥12,100, including tax (Casio Japan listing, 2026) | October 2026 (Casio Japan listing) |
| BGA-20K-4AJR | ¥12,100, including tax (Casio Japan listing, 2026) | October 2026 (Casio Japan listing) |
| BGA-20K-7AJR | ¥12,100, including tax (Casio Japan listing, 2026) | October 2026 (Casio Japan listing) |
Casio’s official product index confirms the three model numbers and listed prices: BGA-20K product listing. A Gizmochina report dated October 5, 2026 described Japanese preorders and expected shipping during October; that timing is the report’s expectation, while Casio’s own listing gives the release month.
Can you wear it as a charm?
Yes. The watch can be worn on its resin band, or its center module can be removed from the band and fitted into the included strap holder. Casio describes the holder as a way to use the piece as a bag accessory or a small desk interior item. The two-way setup is a presentation option, not a separate watch model.
What are the practical specifications?
| Specification | Casio’s stated detail |
|---|---|
| Case size | 43.5 × 42.4 × 11.5 mm |
| Weight | 36 g |
| Case and bezel | Resin |
| Band and holder | Resin band; strap holder included |
| Construction | Shock resistant |
| Water resistance | 10 bar |
| Glass | Mineral glass |
| Battery life | Approximately three years |
| Accuracy | Average monthly difference of ±20 seconds |
| Other functions | Date display and low-battery warning |
These are manufacturer-stated specifications, not independent test results. Casio’s primary product page is for the BGA-20K-1AJR: Casio Japan BGA-20K-1AJR.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where is it launching?
The confirmed listing is Casio Japan’s, and the price above is the Japanese manufacturer-listed price including tax. The sources cited here do not establish an international launch, pricing in other countries, or stock at any particular retailer. For an overseas purchase, check the seller’s exact model suffix, market, shipping terms, return policy, and whether the holder is included rather than assuming the Japanese listing applies.
Quick Recap
Best Value
- Fresh Semi-Transparent Design – Features a glossy translucent white resin band with pink gold accents for a stylish, modern look that pairs with any outfit.
- Shock Resistant & 200M Water Resistant – Built to handle active lifestyles with BABY-G toughness and water resistance suitable for swimming and snorkeling.
- Updated LED Backlight – Newly upgraded with a bright LED backlight for improved visibility in low-light conditions.
- Practical Everyday Features – Includes world time, stopwatch, countdown timer, 5 alarms, Day Counter, and Data Bank memory.
- Compact Yet Durable – Lightweight 46g design with mineral glass and approximately 3-year battery life for reliable everyday wear.
Rank #4
- Classic BABY-G Design – Compact digital watch features the iconic round front protector and durable black resin construction for a sporty, casual look.
- Shock Resistant & 200M Water Resistant – Built with BABY-G toughness to handle everyday impacts and water resistance up to 200 meters for an active lifestyle.
- Super Illuminator LED Backlight – Bright white LED backlight with afterglow makes the digital display easy to read in low-light and nighttime conditions.
- World Time & Everyday Functions – Features world time across 29 time zones and 30 cities, a 1/100-second stopwatch, 24-hour countdown timer, 5 alarms, and hourly time signal.
- Telememo & Day Counter – Store up to 25 sets of names and telephone numbers, while the Day Counter tracks important dates with memory for up to 5 records.
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.
