Sorry for my ignorance on plate cameras and accessories. I just never got into them. However, I received this as part of a package purchase a few years ago and I need help identifying its purpose. Thanks in advance for your help. Pics will be in two posts.
Overall dimensions are 11" wide x 11 7/16" long x 3/4" thick.
/// Back? ////// Front? ////// Pull knob & 1 slide lock