I have this watch from the '90s. It is the same as what you see. Obviously, they have maintained the design and model. Because I have seen it on Amazon, there are some vintage models from CASIO that they have kept because they obviously continue to sell and are considered classic in a way.
This is one of those. Back in the '90s when I got it, it was like today's smartwatches, except it was only offered by CASIO and not other manufacturers. It has time, alarm, hourly signal (which can be turned off), second time, stopwatch, and a calculator with up to 8 digits (including decimals) and basic operations (addition, subtraction, multiplication, division).
As someone who has had it for about 25 years, I can tell you the following:
It is very lightweight but durable (it hasn't scratched, but I took care of it, so it still looks almost new). The glass, although small, is made of mineral crystal, not plastic, which means it doesn't scratch (in all these years, it doesn't have a single scratch). The buttons on the calculator, which are made of medium-hardness plastic (not extremely hard or soft), act like small shields when pressed slightly. Imagine how many times it has accidentally hit walls, sides, desks, etc., or had a few minor falls from a small height, not with force. The buttons, because they protrude slightly, function as a "soft" bumper, absorbing the impact force of an accidental hit. I don't think CASIO had thought of such "double" usefulness for the calculator buttons when they created this model, but it turned out to be much more durable...
It has multiple functions, it is beautiful, now considered vintage design. It is waterproof to the simplest degree, meaning it can withstand accidental exposure to water, like washing hands or light rain, but not for showering or swimming. To be honest, in all these years that I have had it, I have showered with it several times (maybe 20 or 30 times), and it survived. However, now that it has become vintage, I don't risk it. Only in hand washing or light rain.
It is a watch that caught people's attention in the '90s, and it still does, now as retro.
In the earlier years, when I wore it frequently, I regularly used the calculator, which is why the buttons, if you look closely, are a bit worn - nothing significant. Now, of course, since all smartphones have calculators, it is not as useful. Now it is a retro stylish watch.
Negatives (pay attention):
• The screen, where the displayed time and other indications for other functions (e.g., stopwatch, since they use the same screen), is small. When I was younger, I could see it just fine, but now that I have presbyopia, I can't see it without glasses.
• Also, when you are young or have small fingers, using the calculator buttons, which are made of relatively soft plastic (and very small in size), is fine. But now that we have aged a bit and have presbyopia, they are too small to use, even with glasses.
• It does not have a light, so at night, you need external light to see what it says. Do not be deceived by the photo, which, as it is taken, gives the impression that it has backlighting (some on Amazon who played the same photo were deceived and bought it thinking it had lighting).
• Like all watches with plastic straps, this one is relatively easy to cut, especially if you wear it constantly and the sun hits it and it polymerizes. In the many years that I have had it, I have changed the straps 3 times, the first time when its own broke, so then I bought a cheap imitation similar one, it broke too, as well as a second imitation that I bought. Now it has the 4th strap, which seems to hold up well.
In the many years that I have had it, I have changed the battery once.
Finally, I note that what I have, on the back of its stainless steel cover, it said that (then) it was Assembled in Korea. Now, I have seen from Amazon that it is Made in China. But because the watch is the same (I imagine that since it is completely the same from the outside and external materials, it will be the same internally, which we cannot see), I do not think it matters that it is now manufactured in China - after all, it is CASIO, and the Japanese have reliability.
In conclusion: An interesting vintage watch, a magnet for attention, good for its cost, which with a little care in its handling, you will likely have for years....
... and it is also a watch that has been worn in movies:
• Marty McFly in Back to the Future, and
• The Dark Knight, the Joker wore it.
Links:
https://www.yourprops.com/Marty-McFly-Calculator-Watch-replica-movie-prop-Back-To-The-Future-1985-YP52337.html
https://www.yourprops.com/Joker-s-Watch-original-movie-prop-The-Dark-Knight-2008-YP66940.html
[edit 29.10.20] This summer, I saw a girl wearing it at the beach, swimming and diving with it. The watch survived, and I imagine it wouldn't have been the first time the girl went swimming with this specific CASIO. However, even though she got away with it, I consider it risky because the watch is only water resistant, which means it can withstand simple contact with water and not prolonged exposure. The girl who went swimming, especially in the sea and even diving, during which the pressure is undoubtedly greater, I imagine she will probably break it soon. However, it shows that even if you have to fall into the sea with it, it will survive, as long as you don't press the buttons underwater. [end edit]