It looks rather like an Eastman View #2 or Kodak 2D 8x10 back. The way to be sure is to measure the rear dimensions and the space between the pins. If the rear of the back is 11 1/2" square and the pins are roughly 10 3/8" apart, there you go.
Not sure of the value, though. I recently bought a 5x7 reducing back for my 2D for around $45.