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Another 5 EUR find, the picture on the auction page was very bad but it looked old. To my surprise it came New In Box and has a built in calculator/clock.
However it is slightly different, different spring, slightly different hammer shape and transparent instead of opaque. On the back is the patent number as mentioned by chloe on geekhack for the Cheng Ya as issued in 1993. However, the FCC ID on my keyboard was granted in 1991. Still not as good as the IBM buckling spring, but smooth, clicky action and it works. Feels a bit cheap.
The calculator and clock work, but the LCD display is funky and not working well. When I disconnected the keyboard and put it in the box, the clock went on running for half a minute.