Bestseller-28%
Case Thickness16.9mm
Case shapeRound
Second handYes, second hand
Case colourBlack
Strap ColorBlack
Time measurementStopwatch

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Case width 51.2mm
Strap width 28 mm
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GA-100-1A1ER Casio G-SHOCK Big Bang Watch

Customers' rating: 5
€109.00 €79.00 now cheaper by €30.00 Lowest price since 30 days before discounting: €109.00
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More Information G-SHOCK GA-100-1A1ER

Model GA-100-1A1ER
Manufacturer G-SHOCK
Warranty 3 years , extend for a further 3 years
Crystal Mineral
Case Width 51.2mm
Case Thickness 16.9mm
Water Resistancy 200 metres
Movement Quartz, Japanese, caliber Casio 5081
Case material Synthetic
Case colour Black
Case shape Round
Dial color Black
Illumination LED
Strap Material Rubber
Strap Color Black
Strap Width 28 mm
Max. wrist size 21,5 cm
Gender Gents
EAN Code 4971850443858
Product type watch

Details G-SHOCK GA-100-1A1ER

Functions

Auto-LED light

A light-emitting diode (LED) is used to illuminate the watch face, incl. the feature of an Auto Light Switch that illuminates the display when the watch is angled towards the face.

Shock-resistant

Shock-resistant construction protects against impact and vibration.

Magnetic resistant

The housing is designed to shield the clock from magnetic fields.

World time function

Displays the current time in major cities and specific areas around the world.

Stopwatch function - 1/1000 sec. - 100 hours

Measures with an accuracy of thousandth part seconds the meantime and the end time. Signals confirm the starting/stop selection. The measuring capacity reaches up to 100 hours.

Timer - 1/1 min. - 24 hours (with automatic repeat)

For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. They then count back automatically from the preset time. The time can be set to the nearest minute and up to 24 hours in advance. Ideal for people who need to take medicines every day or those who do interval training.

What’s in the box?

  • 3 Year Warranty
  • User Manual
  • Original box

Reviews about G-SHOCK Big Bang GA-100-1A1ER (118)

Customers' rating: 5
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  1. 6/15/26
    100%
    I really like this watch because of its practical calendar and bright LED backlight. The store processed my order quickly. I highly recommend it!
    Olaszex
    This review is helpful for you.
  2. 6/15/26
    100%
    The Casio G-Shock GA-100-1A1ER is a classic among sports watches—bulky, uncompromising, and extremely durable. I mainly wear it outside the office, during physical activities, and in situations where the watch’s durability matters.

    On the wrist, the watch looks very solid. The black, “stealth” design is versatile and fits well with an everyday, sporty style. The large case gives a sense of ruggedness for which the G-Shock line is famous.

    Functionally, the model offers everything I expect from a utility watch: a stopwatch, timer, world time, and high water resistance. The LED backlight works well after dark.
    On the downside, the watch is already over a decade old, so you’ll often see it on the wrists of people who value Casio for its durability and resilience. At the same time, this is its greatest strength—the construction and mechanism are thoroughly tested and proven by thousands of users worldwide.

    In my opinion, the GA-100-1A1ER is a very good choice for those looking for a durable, reliable watch for everyday use, workouts, or travel—especially if they value its distinctive, sporty look.
    MacGuide1
    This review is helpful for you.
  3. 6/15/26
    100%
    Good product, fast delivery.
    Damianb.
    This review is helpful for you.