need some help with this clock?sign

have a chance to purchase this.looks to possibly be NPI? although it has no motor,there looks like there was a place for one.as you caan see ,the center of the lens would have been lit up,but what would have been there. am told its not a clock,but a sign.i am wondering it it had an inner peice of glass,with a design,and then a spinner of some type behind that.a pic of a complete one would really be alot of help .thanks