Mystery Item

I more or less know what this item is. What I am trying to figure out is make, model, etc… There are no markings or connections on the top, bottom, sides or back. Does anyone have any clues?

Do you see any clues that tell you anything about this?
Do you see any clues that tell you anything about this? (Click for a larger image.)

This is a close-up of the tag in the upper corner.

Any clues gleaned from this plate would be helpful.
Any clues gleaned from this plate would be helpful. (Click for larger image.)