The liquid crystal display works as good as it did the first day I had it. A few minor blemishes on the face plate and buttons, but completely functional with the exception of the light bulb which no longer works. Actually, I disconnected the light bulb early on because I didn't like the idea of the extra battery drain every time I did a 'change sign' with the calculator. Several years ago the buttons along the sides were beginning to stick, in the pushed in position. I was able to determine that the cause was hardening of the o-rings used to make the watch water resistant. After cutting away the hardened o-rings the buttons work perfectly again. I'm just a little more careful around water now.
It's getting very difficult to find a battery now. Everyone seems to be dropping the 2020 size. My usual source, Digi-Key, doesn't even carry them anymore. Actually, 2020 size batteries are still available, but with attached leads that are intended for soldering into pc boards. I may try one of those and see how hard it is to remove the leads. Some people report good success using a BR2016 (or CR2016) as an alternative. It's the same diameter, but a little thinner. (April 2007 update: I just bought a BR2020 online from Interstate Batteries.)
Feb 14, 2011 update. About a year ago my watch started malfunctioning. The date would spontaneously change to dates that were impossible. Months with more than 50 days. I would correct it and it would work okay for a few days, then it would do it again. It's been steadily getting worse, now with random resets, so I've had to retire it.
Since being discontinued by Casio, I know of no other scientific calculator watch available to replace the breakdowns of the aging watches. I became aware of the rising value of these unique calculator watches a couple years ago and put up this page just to satisfy my curiosity of how many people would find it with a Google search. Check out the guestbook, lots of interesting comments. Sorry, not looking to sell.
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