Introducing new color variations to the lineup of slim G-STEEL GSTB400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GSTB400D-1A is the stainless steel bezel and bracelet models. The GSTB400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced. In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance. The thickness from the back cover to the bezel top is only 12.9 mm, which is more than one millimeter less than the GSTB100 model. In terms of design, the number of button guards has been reduced as much as possible, enabling the use of large stainless steel buttons that are slim yet easy to operate. The top bezel has been given five different finishes, while the middle bezel has been given four different finishes, which creates an elegant effect and changes the appearance of the texture of the metal depending on the viewing angle.
Introducing new color variations to the lineup of slim G-STEEL GSTB400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GSTB400D-1A is the stainless steel bezel and bracelet models. The GSTB400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced. In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance. The thickness from the back cover to the bezel top is only 12.9 mm, which is more than one millimeter less than the GSTB100 model. In terms of design, the number of button guards has been reduced as much as possible, enabling the use of large stainless steel buttons that are slim yet easy to operate. The top bezel has been given five different finishes, while the middle bezel has been given four different finishes, which creates an elegant effect and changes the appearance of the texture of the metal depending on the viewing angle.
Introducing new color variations to the lineup of slim G-STEEL GSTB400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GSTB400D-1A is the stainless steel bezel and bracelet models. The GSTB400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced. In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance. The thickness from the back cover to the bezel top is only 12.9 mm, which is more than one millimeter less than the GSTB100 model. In terms of design, the number of button guards has been reduced as much as possible, enabling the use of large stainless steel buttons that are slim yet easy to operate. The top bezel has been given five different finishes, while the middle bezel has been given four different finishes, which creates an elegant effect and changes the appearance of the texture of the metal depending on the viewing angle.
Introducing new color variations to the lineup of slim G-STEEL GSTB400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GSTB400D-1A is the stainless steel bezel and bracelet models. The GSTB400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced. In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance. The thickness from the back cover to the bezel top is only 12.9 mm, which is more than one millimeter less than the GSTB100 model. In terms of design, the number of button guards has been reduced as much as possible, enabling the use of large stainless steel buttons that are slim yet easy to operate. The top bezel has been given five different finishes, while the middle bezel has been given four different finishes, which creates an elegant effect and changes the appearance of the texture of the metal depending on the viewing angle.
Last updated at 06/05/2026 17:58:47
GSTB400D-1A
Casio Shock B400 Wristwatch Main Unit
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Casio G-shock Case Size 4cm ×5cm Used Watch 5232422419
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Casio G-shock Case Size 4.1 ×5cm Wrist Size 17cm Used Watch 4169442830
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Casio G-shock Case Size 5.5 ×4.9cm Wrist Size 16cm Used Watch
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Casio G-shock Case Size 6.5 ×5cm Wrist Size 23.5cm Used Watch
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Casio Gst B400 Shock Steel Watch Timepiece 18cm Wrist Authentic
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Casio Shock Steel Gst B400 Wrist Size 18cm
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Casio Gshock Gstb400d1a Gsteel Solar Bluetooth Watch 2021 May Release
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Casio Shock Gst B400 Metal Band Tough Solar
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originally posted on dillards.com
I bought this as a Christmas gift for my boyfriend, absolutely love it! The style is perfect , classy and sporty!
originally posted on dillards.com
I love this watch. It is one of my favorites.It is a metal Gshock for everyone. Typically Gshocks are huge and unwieldy. This is one of the smallest and thinnest Gshocks out there but it retains the technical look that made Gshocks famous. Even better it is made of lots of metal parts mixed with carbon-resin material to keep it softer on the wrist while retaining shock absorption properties. It has solar, Bluetooth sync (for accurate time and semi-smart functions), dual time zone, alarms, etc. What else do you need in a watch?One minor con: the metal indexes are blackened so it's a bit hard to see them. It completes the look. I wish they lumed the white paint. That would make this watch perfect.
originally posted on watchdirect.com.au
Great quality and excellent time piece for the price.
| LED | White |
| Digital | Hour, minute, second, pm, month, date, day |
| Bluetooth | Yes |
| Date | Yes |
| Day Of The Week | Yes |
GSTB400D-1A
Casio Shock B400 Wristwatch Main Unit
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Case Size 4cm ×5cm Used Watch 5232422419
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Case Size 4.1 ×5cm Wrist Size 17cm Used Watch 4169442830
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Case Size 5.5 ×4.9cm Wrist Size 16cm Used Watch
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
I bought this as a Christmas gift for my boyfriend, absolutely love it! The style is perfect , classy and sporty!
I love this watch. It is one of my favorites.It is a metal Gshock for everyone. Typically Gshocks are huge and unwieldy. This is one of the smallest and thinnest Gshocks out there but it retains the technical look that made Gshocks famous. Even better it is made of lots of metal parts mixed with carbon-resin material to keep it softer on the wrist while retaining shock absorption properties. It has solar, Bluetooth sync (for accurate time and semi-smart functions), dual time zone, alarms, etc. What else do you need in a watch?One minor con: the metal indexes are blackened so it's a bit hard to see them. It completes the look. I wish they lumed the white paint. That would make this watch perfect.
Great quality and excellent time piece for the price.
I bought this as a watch to wear daily and hold up with the type of work I do, the stainless silver band and dial makes it a watch I can wear anywhere without it being too flashy or too dressed down. It's a watch for any occasion. Alongside the many functions the watch can allow the g-shock connected app allows the first setup out of the box go smoothly without having to read the manual and discover what button presses do what until you're ready to do so. Overall fantastic watch
This is the first G shock that I've owned that wouldn't show full power. So far, I've kept it in direct TEXAS sunlight for an hour straight 3 different days while on my bike. It drives me crazy not to have a full powered watch. The watch still works though. If there's a charging problem,,,, that remains to be seen. I'll be sure to keep you updated
Did some research on types of G Steel watches that would not be too large for my wrist. After looking at several reviews on You Tube, I decided on this one and it was more than I expected. Nice fit and digital time is easier to read for aging eyes. Love it!
I am very impressed with my new timepiece it looks very smart when worn and i've had a number of compliments as regards this timepiece. it is easy to operate and i was surprised how lite it is. Very satisfied with my purchase and also very satisfied with Firstclasswatches ordering process from order to delivery very smooth and i will certanly be using Firstclasswatches in the future.
I purchased the watch at a great price from First-class watches, ordered on Saturday night and it arrived Tuesday morning with DPS.Very happy with the watch it's extremely high quality for the price plus it's not too big for a G-Shock.It arrived well packaged and with a fully stamped warranty card.Overall great service and I think this is now going to be my go to website for any future watch purchases.
Amazing!!! Great price and then even had a discount code. Arrived next day. Phenomenal service & beautiful watch- pictures don’t do it justice!The watch itself is nice and weighty. Superb quality (as with all G Shocks). Love it!
| LED | White |
| Digital | Hour, minute, second, pm, month, date, day |
| Bluetooth | Yes |
| Date | Yes |
| Day Of The Week | Yes |
