Need help knowing what this is and how much I can get for it. An older lady at the yard sale where I bought this told me it was very old and that you're supposed to put water in it and put a plant in it... it's like a planter.  

Made for us by the Diplomat Clock Company of Spanish Fort, AL and was wondering how to find out what it would be worth today.  It's a Self-Adjusting; Eight-Day; Weight-Driven; Triple Chimes with Lyre Pendulum and Moon Dial.