Casio G-Shock GA-100 Watches

About the Watch in short. A typical representative of the round cases G-Shock and the record holder for the number of all kinds of colors and stylistic options, for which it is popular with modern youth. The case belongs to the category of “large” – 55 mm in height and 51 mm in width. Impact resistance consists of characteristic “influxes” on the front part that protect the glass from direct impacts and a step strap with pin mounting. Large buttons are conveniently pressed thanks to the ribbed surface and are protected from accidental pressing. In addition to resistance to mechanical damage, the watch has protection against magnetic fields. Ana-DJ dial is an ideal combination of information content and ease of reading data. Despite the low price, the GA-100 is equipped with a very accurate stopwatch for 100 hours, a timer with auto-repeat, world time, an alarm clock and a simple speedometer that works in conjunction with a stopwatch [you must specify the distance in advance]. Auto backlight will be activated in the dark when the clock turns to face.


Quick Content Guide

  1. Famous people wearing G-Shock GA-100! *updates
  2. Japanese approaches to Tough and Functional Watches in GA-100 *the most distinctive features in details
  3. General information about the watch *year of first release, model range etc.
  4. GA-100 Usage Patterns *what the watch is usually meant for
  5. Feedback from Users and Experts *anonymous from different sources
  6. GA-100 Model Range *in different colors and bands
  7. GA-100 Limited Editions *unique style, materials, and price
  8. The most distinctive specs *from our Editorial point of view
  9. Other G-Shock GA Watches *similar by price and functions but different by cases
  10. G-Shock GA-100 on the wrist! *only images and only on the wrist
  11. Official GA-100 Specs *all details and for base version GA-100-1A1
  12. GA-100 Comparison Table *with similar G-Shock Watches
  13. Full Photo Gallery *various images

Famous people wearing G-Shock GA-100!

English actor Bradley James is wearing G-Shock GA-100
Indian actor and producer Saif Ali is wearing G-Shock GA-100

Have you seen this watch with another person? Let us know!


Enjoy Japanese approaches to Tough and Functional Watches!

*some images are about G-Shock 5000/5600 cases, but the technology, approaches, concepts and philosophy remains the same for the whole G-Shock Model Range

Hollow case structure. Based on a realization that “shocks are not transmitted inside a bouncing rubber ball,” the structure was designed to let the module float inside the case, relieving shocks transmitted from outside. Today, the module’s shock resistance is realized through further technical innovations. But the revolutionary tough structure that gave G-SHOCK its origin began here.

All-directional covering. If the watch is dropped, the protruding bezel fully enclosing it absorbs the shock, protecting the buttons directly connected to the module and alleviating shocks from all directions. The bezel also guards the surface of the crystal. The band is curved stiffly at the point of connection with the case, moreover, enabling it to serve as a shock absorber and prevent direct shocks to the back of the case.

Protective cushioning of key parts. The crystal oscillator and other critical parts inside the module are guarded individually by cushioning material. Any strong shock to the watch causes immediate distortion of the cushioning inside the module, preventing contact failure and malfunction.

Japan Quality. Constructed with genuine quality, CASIO products provide truly practicable applications in which functionality and beauty combine. The leading-edge LSI technologies and skilled craftsmanship that give life to CASIO watches exemplify the quality Japan boasts in the world marketplace.
For CASIO, “faith in manufacturing” refers to an inexorable advancement of digital technologies and an uncompromising commitment to fine craftsmanship. This faith engenders unparalleled performance that not only elevates CASIO watches as close as possible to perfection, but that actually changes their wearers’ lifestyles.

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General Information

Price70$ *average Amazon Price, we may earn commission from purchases
Year of first Release2010
Module Number5081 / Manual
Model RangeGRAVITYMASTER (Developed in response to pilots’ needs, these tough watches offer improved accuracy, strength and practicality. Famous for unique and beautiful aviation design (usually analog) and advanced technologies.)
Battery TypeCR1220 (G-Shock Batteries)
Buy Battery on Amazon →

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GA-100 Usage Patterns *what the watch is usually meant for

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Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.

PROs
+ good visibility
+ cheap
+ amazing look
+ these watches though cumbersome to set are great to own. Very rugged and precise
+ the lume on this watch looks very good especially considering your in a lit room and it just blazes & although the digital sections aren’t lumed you can still see the face very clearly
+ for the price it’s unbeatable and it has everything you need

CONs
– weak illumination at night
– basic features
– the biggest deal breakers are the lack of lume and the poor case light that these models come with, but if you don’t really care about that, it’s a no brainer
– the hands should be lumed

Feedback from Experts *based on comparison info with similar watches by price, model range, etc.

PROs
+ hourly Time Signal
+ affordable price
+ 1/1000-second stopwatch
+ Auto-Back Light
+ Magnetic Resistance

CONs
– only 29 time zones
– only 2 years battery

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GA-100 Model Range *may be updated

*You may find updated information about colors on our G-Shock 2021 New Releases page →

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GA-100 Limited Editions *unique style, materials, and price

The Listing of All G-Shock GA-100 Limited Watches → *with detailed description about the style

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The most distinctive specs of GA-100 *Editorial
— 200-meter water resistance
(good for swimming but not for deep diving)
— Speed measurement (if you know the distance, you will know the speed in your watch)
— ISO 764 class magnetic resistant (A magnetic-resistant plate is mounted on the module. The plate prevents magnetic fields from interfering with proper movement of the hands in daily use)

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Other G-Shock GA Watches *similar by price and functions but different by cases

These are not all G-Shock GA Series. Here is a list of All G-Shock GA Watches →


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Official Marketing Focus from Casio

Introducing a collection of new G-SHOCK models whose 35mm diameter faces and large cases give them a look of power and strength.
Dial rings and raised hour markers create three-dimensional depth that gives the face plenty of character.
The popular G-SHOCK three-dial face design incorporates one analog dial in the center, with digital dials on either side.
These watches are designed and engineered to deliver outstanding shock resistance and water resistance, as well as anti-magnetism.
Over-sized buttons come with a checkered anti-slip surface to make operations fast and sure.
1/1000-second stopwatch, velocity indicator, World Time, 5 alarms and much more provides these models with unmatched function and performance.


G-Shock GA-100 on the wrist!

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Official GA-100 Specs / Features *for base version GA-100-1A1

  • Case / bezel material: Resin
  • Resin Band
  • Magnetic Resistant
  • Shock Resistant
  • Mineral Glass
  • 200-meter water resistance
  • LED light
    Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
  • World time
    29 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping
  • 1/1000-second stopwatch
    Measuring capacity: 99:59’59.999”
    Measuring modes: Elapsed time, lap time, split time
    Others: Speed (0 to 1998 units / hour), Distance input (0.0 to 99.9)
    Mach indicator (speed exceeding 1225 units / hour)
  • Countdown timer
    Measuring unit: 1 second
    Countdown range: 24 hours
    Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
    Other: Auto-repeat
  • 5 daily alarms (with 1 snooze alarm)
  • Hourly time signal
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Regular timekeeping
    Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (speed)
    Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month
  • Approx. battery life: 2 years on CR1220
  • Size of case : 55×51.2×16.9mm
  • Total weight : 70g

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GA-100 Comparison Table with similar G-Shock Watches


GA-100

Price (Amazon)

Year of first Release

2016

2013

2012

Accuracy

±15 seconds per month

±15 seconds per month

±15 seconds per month (with no signal calibration)

SmartWatch Features

No

No

No

Light

LED light (Super illuminator)

LED light

Neobrite (hands and hour markers) and LED light

Alarm

5 daily alarms (with 1 snooze alarm)

5 daily alarms (with 1 snooze alarm)

5 daily alarms

Timer

Measuring unit: 1/10 second
Countdown range: 60 minutes
Countdown start time setting range: 1 to 60 minutes (1-minute increments)

Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)

Measuring unit: 1 second
Countdown range: 100 minutes
Countdown start time setting range: 1 second to 100 minutes (1-second increments, 1-minute increments)

Stopwatch

1/100-second stopwatch
Measuring capacity: 23:59’59.99”
Measuring modes: Elapsed time, split time, 1st-2nd place times
Others: target time alarm, direct timing start from the timekeeping mode

1/1000-second stopwatch
Measuring capacity: 99:59’59.999”
Measuring modes: Elapsed time, lap time, split time
Others: Speed (0 to 1998 units / hour), Distance input (0.0 to 99.9)
Mach indicator (speed exceeding 1225 units / hour)

1/100-second stopwatch
Measuring capacity: 59’59.99”
Measuring modes: Elapsed time, split time, 1st-2nd place times

Hourly Time Signal

Yes

Yes

Yes

World Time

31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping

29 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping

31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping

Auto-Back Light

No

Yes

Yes

Magnetic Resistance

No

Yes

No

Case / bezel material

Resin

Resin

Resin / Aluminum

Glass

Mineral Glass

Mineral Glass

Mineral Glass

Battery

5 years on CR2016

2 years on CR1220

Solar powered CTL920

Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size

57.5×53.4×18.4

55×51.2×16.9

52×46.4×14.9


Full features (if you want to know more)

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GA-100 Replacement Band (Strap) *availability
We think it is very important (before buying a new watch) to know if there will be some choice as for replacement bands for GA-100 (in future or even now). So we made a research and you shouldn’t worry about your future as the bands are available for buying.

starting from 34$ on eBay →
starting from 18$ on PacParts →


Recent News about GA-100 

All Casio GA-100 News →


You ask, we answer…

How does Speed measurement in GA-100 work?

If you know the distance, you will know the speed in your watch.

What does ISO 764 class magnetic resistant in GA-100 mean?

A magnetic-resistant plate is mounted on the module. The plate prevents magnetic fields from interfering with proper movement of the hands in daily use.

What model range does GA-100 belong to?

STANDART ANA-DIGI (This Line includes Digital and Analog displays on G-Shocks that are the best in “price/quality” category. Usually have traditional digital functions, but with beautiful hands. Don’t worry, the hands won’t prevent you from seeing digits, since there is a special Hand Shift technology that moves them to the neutral position).


Not sure about GA-100? There are more G-Shocks!

Back to All G-Shock Models →

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