I think Artex should be banned from this forum for life for such posts 😁
On a side note, I came to my friend's place for a cup of tea and some apple cake, and he gave me this.
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It's a "Graphic information manipulator EC1841A002", in modern terms, a mouse. This particular model is a part of a Soviet XT counterpart called EC1841 manufactured in the late 1980s in Minsk, Belarus:

The interface might be compatible with the standard serial ports, I have not checked this yet.
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Not only does it have ridiculously thick cable, it also features a steel ball and even ball bearings!
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I see little use in owning one, but I have a business trip to Ekaterinburg planned for this year and I've heard there's a computer museum there. I'd be happy to pay it a visit and donate this rarity where it belongs.