CasiOak Carbon Core Guard

SKU: GA2100-1A

Rated 4.9 out of 5
Based on 8 reviews
$269.00 AUD $179.00 AUD

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Carbon Core Guard structure
Ever since the first DW-5000C went on sale back in 1983, G-SHOCK has continued to push the limits of timekeeping toughness while creating new and original designs. These new models embody these efforts in an attractively thin configuration.
These new models inherit the octagon form that was also employed for the original DW-5000C. Analog-digital timekeeping comes packed into a no-nonsense simple design without sacrificing G-SHOCK level toughness.
High-strength resin material, which is reinforced with carbon fibers, makes it possible to create a case that is a mere 11.8 mm thin, which is the thinnest among G-SHOCK combination models.

  • Neobrite: Only for GA-2100-1A, GA-2100-4A

  • Carbon Core Guard Structure
    A new carbon core guard structure protects the module by enclosing it in a carbon case. The case is made of fine resin embedded with carbon fibers for outstanding strength, crack resistance, and durability.

    Feature Overview


    2 Years


    G-Shock Box

    Case Size




    Glass Material




    Water Resistance

    200 Meters

    Band Type

    Black Resin


    • Shock Resistant
    • Carbon Core Guard structure
    • Mineral Glass
    • 200-meter water resistance
    • Case / bezel material: Carbon / Resin
    • Resin Band
    • Double LED light
      LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
      LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
    • World time
      31 time zones (48 cities + coordinated universal time), daylight saving on/off
    • 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 modes: Elapsed time, split time, 1st-2nd place times
    • Countdown timer
      Measuring unit: 1 second
      Countdown range: 24 hours
      Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)
    • 5 daily alarms
    • Hourly time signal
    • Hand shift feature
    • Full auto-calendar (to year 2099)
    • 12/24-hour format
    • Button operation tone on/off
    • Regular timekeeping
      Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day)
      Digital: Hour, minute, second, pm, month, date
    • Accuracy: ±15 seconds per month
    • Approx. battery life: 3 years on SR726W × 2
    • LED:White


    average rating 4.9 out of 5
    Based on 8 reviews
    • 5 Stars
      7 Reviews
    • 4 Stars
      1 Review
    • 3 Stars
      0 Reviews
    • 2 Stars
      0 Reviews
    • 1 Star
      0 Reviews
    100% of reviewers would recommend this product to a friend
    Review posted
    Reviewed by Norm W.
    Verified Buyer
    Rated 5 out of 5

    Watch Review - G-Shock CasiOak Carbon Core Guard GA2100-1A

    A solid good looking watch with simple uncomplicated face. Arrived well packed and with speedy delivery.

    Lighting of watch face not very bright. Still satisfied! Use it mainly for outings and exercise.

    I recommend this product
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    Review posted
    Reviewed by Jade T.
    Verified Buyer
    Rated 5 out of 5


    Awesome product and great customer service

    I recommend this product
    Was this helpful?
    Review posted
    Reviewed by Jacob K.
    Verified Buyer
    Rated 5 out of 5

    solid watch

    simple watch, with lots of features and easy to style.

    I recommend this product
    Was this helpful?
    Review posted
    Reviewed by Torsten D.
    Verified Buyer
    Rated 4 out of 5

    Review of my G-Shock GA2100-1A

    I like the uncomplicated but yet stylish look of this watch. I do like analogue watches with the added benefit of digital LCD alarm setting, stopwatch and timer. The only downside of this watch is that the LED digits are extremely small and dark to see, making it necessary to angle the watch against the ambient light to read them. However, the important part is that the watch keeps superb time and I'm able to wear it when I'm in the water.

    On another note: thank you to Watch Direct for a superb service. I ordered the watch Thursday around noon, received a message that afternoon to say the watch has been dispatched, received the watch the following Monday - couldn't ask for a better service. Furthermore the purchase price of the watch from Watch Direct was the best I could find. I'm happy!

    I recommend this product
    Was this helpful?
    Review posted
    Reviewed by Mainak C.
    Verified Buyer
    Rated 5 out of 5

    First Gshock

    This is the first time I am using G-Shock and am quite happy with the watch, the awesome looks and rugged build quality that can take a beating. Looking forward to add many more Gshocks to my watch collection in future .

    I recommend this product
    Was this helpful?

    Shipping & Returns


    Free Shipping with Standard Post anywhere in Australia.

    • Most orders ship within 24 hours.
    • Same Day Delivery available in Sydney, call us on 1300 725 644 for details.
    • Signature on Delivery is included on all shipments within Australia.  We ship with AusPost and StarTrack.
    • DHL Express is available for fast and secure international shipments.

    View our Shipping Page for More Information

    Extended Christmas Returns are now in Effect! Starting October 20th, 2023 all orders are eligible for return by January 20th, 2024

    To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

    View our Returns Page for More Information

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