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I cannot find a part number on it. It has the official logos on the studs. What is this? What theme does it originate from?combination of a 4x4 plate, a 5x2 plate and an arc with a ball joint

It looks like a combination of a 4x4 plate, a 5x2 plate and an arc with a ball joint.

1 Answer 1

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That is the Vehicle, Trailer Base 4 x 13. It came in one set, the #378 Tractor from 1972.

Found by searching first 4x9 (didn't find it) and then 4x13 (the total length).

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