Bought an interesting item today.

Appears to be a door, but it has no hinges to open or close it. 4'10" tall and 2 ft wide. 3 pains of glass across the top, 6X6" with 3 longer pains below them. The really strange thing is there is a small 12X6 window just below the middle top pain that is hinged and has a latch. Looks to be a door one could stick a hand into. Has an Arts and Craft style to it. I'm more inclined to think it is a architectural item, built into a wall.
Kind of puzzle I love to figure out, but I'll need some help with this one. Would be a wonderful item to take to the Antique Road Show for an opinion. The lady having the yard sale didn't know anything about it...so I got it cheap.