Could have been used once to test. Including base plate (last two pictures).
Note base plate is not Acratech, not sure who that was from. In great condition, works smooth.
Does not come in original case. The item "Acratech Ultimate Ballhead Quick Release Detent Pin, Left Rubber Knobs and Plate" is in sale since Tuesday, November 20, 2018. This item is in the category "Cameras & Photo\Tripods & Supports\Tripod Heads". The seller is "auctionsathe" and is located in Novi, Michigan. This item can be shipped to United States.