Arts and Crafts Desktop File Organizer

I found this antique Arts and Crafts piece at an estate sale and think it's a type of desktop file organizer. The surface has a landscape scene with hand colored mountains and trees executed in relief. I have been trying to research the maker but haven't had any success identifying the mark. It looks like the letters LD inside a rectangle to me but I could be wrong. Thanks for any help in solving the mystery!