This rare vintage Simmon Bros Inc. Omega 7204 copy attachment is for use Automega B-9 and Omega B-10 2 1/4 x 2 1/4'' enlargers. It accepts 2¼x3¼" Speed Graphic film holders. There are a couple of light scuffs on its exterior, but nothing major.
Fidelity
Polaroid
Nikon
Kodak