Recently I got my first Curta II. It is in great condition. However, it has a small misprint on the bottom numbers labeling the registers. Instead of being labeled 11 to 1, the registers are labeled as "11 10 9 8 7 6 5 4 5".

I am curious how this could happen. Is this the result of a repair, a production error or something else?

It can be seen on a picture of a previous auction of the Curta (on the right):
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