Linhof Kardan 4x5 Rail Camera #0 162mm Recessed Lens Board
This is a Linhof Kardan board for #0 shutters. It is ~162mm x 162mm with ~3/4" recess.
It does not have a brand name but it appears to be machined, something that I do not think that a knock-off brand would do. The board is standard #0 size.