This is Pro Media Gear, model PLSA7-2 which is arca swiss style. It was originaly made for the second generation A7 series cameras: A7 mk ii, A7r mk ii and A7s mk ii. However, it fits A7r iii, A7 iii and A9 just as nicely (the camera in the last two pictures is an A7r iii )!
The bracket is used and is in excellent condition. It comes with an Allen wrench that can be stored inside the bracket. I had RRS L-plates before and this is just as good (made in USA). An important advantage is that the vertical arm can be extended to be further away from the camera (variable distance) making it easier to have access to the camera ports on the left side.
It sells for about $200 in stores and I am selling it for $110. Interested people can reach me at afficher coordonnées