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I suspect it might be related to a train coupler but I could be totally wrong. I couldn't find it in the train parts category on Bricklink. It seems similar to part 2920.

It has an open stud on the top and an antistud on the bottom, and a regular axle hole going across. The clip things that are on one side are smaller than the diameter of a regular bar.

It says "(C) Lego Group" and "3" and "01" but I do not see a part number.

the piece in question - diagonal view the piece in question - top view

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It's in the Magnet category: 2607 Magnet Holder 2 x 3 with Clips and Pin Hole. It connects to Magnet Cylindrical.

Magnet Cylindrical

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  • 6
    These were used heavily in the 90s with their underwater line and I think some of the digger line. Commented Jun 6, 2022 at 13:37
  • 5
    They were also the key naming item in the M-Tron space sets. Commented Jun 6, 2022 at 17:27

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