Casio G-Shock G-100 Watches

About G-100 in Short. The owner of one of the smallest cases among all G-Shocks. Despite its modest dimensions [49.6 × 47.8 × 15.7 mm], the model is not inferior to colleagues in the shop in terms of impact resistance and security. The dial, although ana-DJ [and hands and electronic display], is not overloaded with information and looks minimalistic. Due to its “secretive” design and brutal shooters, the G-100 is in demand among the military and other security forces. The clock module is protected against magnetic fields. For those who travel frequently, there is quick access to the time in the second time zone. Stopwatch, world time, timer, alarm and calendar – all you get for a low price.

General Information

Price$61  *average Amazon Price, we may earn commission from purchases
Year of First Release2011
Battery Type CR2016 (Casio Batteries)
Manual5158 (official)

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

+ cool looking
+ comfortable
+ tough
+ easy to use

– hands hard readability
– useless “afterglow” feature

G-100 Model Range *may be updated

*Want to be the first to know about new G-Shock Updates? Here we store all recent Monthly G-Shock Updates →

The most distinctive specs of G-100 *Editorial
200-meter water resistance (good for swimming but not for deep diving)
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)
Dual Time (In addition to the time in your current location, which is indicated by wide hour and minute hands, a second time can be indicated by the digital dial)

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

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

Official Casio Description. From G-SHOCK, the watch that sets the standard for timekeeping toughness, comes the latest models to feature basic G-SHOCK black that captures the essence of one-tone resin. This model is based on the G-100, which is designed to withstand impact from any direction. A simple matte black finish allows the form of the watch itself to come out, while the buckle and buttons have a black ion plate finish. Everything about this new basic black model captures the very essence of the rough, tough basic G-SHOCK image.

Casio G-100 on the wrist!

Official G-100 Specs / Features *for base version G-100BB-1A

  • Case / bezel material: Resin
  • Resin Band
  • Neobrite
  • Magnetic Resistant
  • Shock Resistant
  • Mineral Glass
  • 200-meter water resistance
  • Electro-luminescent backlight
  • Dual time
  • 1/100-second stopwatch
    Measuring capacity: 00’00″00~59’59″99 (for the first 60 minutes)
    1:00’00~23:59’59 (after 60 minutes)
    Measuring unit: 1/100 second (for the first 60 minutes)
    1 second (after 60 minutes)
    Measuring mode: Elapsed time
  • Daily alarm
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Regular timekeeping
    Analog: 2 hands (hour, minute (hand moves every 20 seconds))
    Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month
  • Approx. battery life: 3 years on CR2016
  • Size of case : 49.6×47.8×15.7mm
  • Total weight : 65g

Recent News about G-100 

All Casio G-100 News →

You ask, we answer…

What does 200-meter water resistance in G-100 mean?

The watch is good for swimming but not for deep diving.

What type of battery does G-100 have?

3 years CR2016.

What does Stopwatch in G-100 do?

Measuring capacity: 00’00″00~59’59″99 (for the first 60 minutes).

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