GSHOCK mens Automatic Watch, analog-digital Display and Resin Strap GA100-1A4
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Brand | Casio |
Band material type | Plastic |
Watch movement | Automatic |
Dial colour | Black |
Band colour | Black |
About this item
- Shock Resistant
- Magnetic Resistant
- 200m water resistance
- Auto LED Light with Afterglow
- Shock Resistant Magnetic Resistant200 Meter Water Resistant Auto LED Light with Afterglow World Time
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+ $8.91 delivery
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Product specifications
Watch Information
Brand Name | Casio |
---|---|
Model number | GA-100-1A4ER |
Part Number | GA-100-1A4ER |
Model Year | 2010 |
Item Shape | Round |
Dial window material type | Mineral |
Display Type | Analog-Digital |
Clasp Type | Buckle |
Case material | Resin |
Case diameter | 5.2 centimetres |
Case Thickness | 17 millimetres |
Band Material | Plastic |
Band length | Men's Standard |
Band width | 25 millimetres |
Band Colour | Black |
Dial Colour | Black |
Calendar | Day-Date |
Special features | Stop Watch^Alarm^countdown |
Weight | 70 Grams |
Movement | Automatic |
Water pressure resistance | 20 bar |
Water Pressure Resistance | 200 metres |
Warranty type | Distributor |
Warranty Description | 2 years |
Warranty | If this product is sold by Amazon, please review the manufacturer’s website for warranty information. If this product is sold by another party, please contact the seller directly for warranty information for this product. You may also be able to find warranty information on the manufacturer’s website. |
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Product description
Product Description
The popular GA100-1A4 G-SHOCK three-dial face design with over-sized buttons comes with a checkered anti-slip surface to make operations fast and sure.
Set Contains:
Watch, Manual and Warranty
From the manufacturer
G-SHOCK Standard Duo/Chrono GA100-1A4

Technical specifications
- Shock resistant
- 200m water resistance
- LED light with Afterglow
- Countdown Timer
- 5 daily alarms (with 1 snooze alarm)
- Full auto-calendar (to year 2099)
- Approx. battery life: 2 years on CR1220
- Case size: 55 x 51.2 x 16.9mm
- Total weight: 70g
Casio G-SHOCK
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.
Key features
- Magnetic Resistant.
- World Time (29 time zones).
- 1/1000-second stopwatch.
Product details
- Batteries : 1 LR44 batteries required. (included)
- Is Discontinued By Manufacturer : No
- Product Dimensions : 20 x 20 x 20 cm; 70 Grams
- Date First Available : 1 January 2018
- Manufacturer : GSHOCK
- ASIN : B0039N480I
- Item Model Number : GA-100-1A4ER
- Department : Men
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Amazon Bestsellers Rank: 2,169 in Clothing, Shoes & Accessories (See Top 100 in Clothing, Shoes & Accessories)
- #32 in Men's Wrist Watches
- Customer Reviews:
Customer reviews
Top reviews from other countries

It's important to note that the main gripe people have with this watch (and the thing I was most concerned about) is the LED light that illuminates the face. I NEEDED this watch to be usable in the dark so was prepared to return the watch in the event of the watch being 'unreadable', as some people have described it as being. I cannot emphasise this enough, THE LIGHT IS ABSOLUTELY FINE. I am aware it's all down to personal preference, but I have absolutely no problem reading this watch - both the hands AND the digital screens - in the dark. Yes, it's not optimal - a light behind the screen would be more functional, but if you desperately require that feature you're better off buying the GD-100 or similar full digital G-shock anyway. The benefit of the light on this watch being where it is is that it can actually be used as a torch (albeit a weak one) in a pinch to illuminate a map or whatever you need to see in the dark. Also, remember that this single LED style of illumination is not exclusive to this watch - the £100+ analogue/digital G-shock watches also use this method of illumination. That's just how it is.
Seriously - go try this on in a shop and see for yourself. The LED on this watch is BRIGHT and you will have no problem reading the watch in the dark. It also just looks awesome. It's just a makes the watch look really, REALLY cool. So in conclusion - the light is fine, don't let it put you off.
The watch is extremely comfortable (I'm wearing it right now!) and not too big - but it's a G-shock, so obviously it's pretty big. Casio have managed to get the perfect balance of weight. It's sturdy and weighty enough that it doesn't feel cheap or plasticy, yet it's absolutely NOT what you would describe as a 'heavy' watch - indeed it is very light weight.
Really can't say enough good things about this watch. At £55 (this watch is £110 on the high street!!) this watch is an absolute steal. Comes in a beautiful G-shock tin to boot. Absolutely brilliant, feature-full and practical watch. I would highly recommend it to anyone.


Everything about this watch was excellent, apart from one item - sadly it was a deal breaker: the backlight was so dim that he was unable to view the watch in the dark, which he needs to do regularly at work. I didn't quite believe him until he showed me how weak the backlight was on the model we received. I am not certain if it is due to the age of the technology used in the watch (This watch was released in 2010) or perhaps I just received a damaged model.
Either way, I had to return the watch and purchase another model as the backlight was just too anemic to be of use, and that was a feature that my husband required.


Reviewed in Spain on 17 October 2018



Reviewed in Italy on 18 July 2019



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